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Newly produced HK P7’s

4.1K views 63 replies 26 participants last post by  bac1023  
#1 ·
Looks like a company is manufacturing frames for this gun, using HK slides.

Interesting…

 
#32 · (Edited)
I agree that the accessory rail on the frame greatly uglifies the gun. they should offer two different frames, a "Modernized" version, and a "Classic" version.

I'm old enough to have been around when those guns first came out and was able to handle them and admire them and even shoot them, but never had the money to buy one. I loved how they pointed so naturally and how they balanced in the hands.

And what I especially liked was the precice single action trigger and the squeeze-cocker that allowed you to safely carry with a round in the chamber and I've never understood why no other squeeze-cocker guns have ever been developed.

The P7's gas operated design was complicated and had it's drawbacks but I don't understand why just the squeeze-cocker mechanism itself couldn't be used in an equally well-proportioned but lighter weight polymer framed gun with a more simple short recoil locked-breech mechanism but with a single action rather than a striker fired trigger and with the excellent squeeze-cocker safety mechanism.

After having shot one of these guns, one thing I noticed was that it took some hand strength to cock the gun, but that helped you to get a firm grip on it, (limp-wristing would be difficult) and in stress situation, "Adrenaline Assist" would come in to play.
 
#3 ·
yes I looked at one they offer a few options , if you look around you can find the originals close to the asking price there was also talk of converting them to a roller lock like the P9s, The guy running the show has been on HK pro for quite a long time .
 
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#4 · (Edited)
I wonder if they found a way to not turn the frame incandescent when firing a single magazine at speed?

I'm betting not since the entire system is based on direct gas being blown right above your trigger finger. And yeah, the M8 variations polymer insert (which this appears to be except for the titanium/rail version) mitigated frame overheating slightly, but not nearly enough.

Interesting as a high end range popper, or if you want to "get your Hans Gruber on", but no thanks for a carry gun.

Been there, done that, not going to repeat. I had a hard chromed M8 and just got tired of waiting for it to cool down during training.
 
#10 ·
Were you an LEO that carried one? I remember back in the early 80's where just about every state police agency carried .357's but then, New Jersey and Illinois (I think) went to the P7. Being in my early 20's then and without a pot to piss in, I remember thinking "how cool" and exotic they were. They were certainly expensive to issue to an agency.
 
#18 ·
Nice, but I can get a H&K off Gunbroker for just a little more than these people want for a copy.
 
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#20 ·
HK explains it better
Technical Engineering Detail of the G3
The Roller Locking System in Detail



The G3 Automatic rifle has often been described in numerous German and foreign military and weapons journals.

Generally, the operation of the bolt system, the basis of most other small arms of the HK weapons family was only treated briefly, and many times superficially. This can be the cause of misunderstandings, especially if a delayed inertia bolt is spoken of.

As the leading manufacturer, we feel that the time has come to depict the bolt system of the G3 rifle in such a manner that, in addition to the circle of knowledgeable weapons experts, it can also be understood by technically interested weapons enthusiasts, without neglecting technical and physical accuracy. Numerous tests confirm the validity of the theoretical principles described below.

Let us assume it is known that the simplicity and ruggedness of automatic weapon bolts, comprised only of a mass and a spring cannot be surpassed.

For this reason, our discussion should begin with this type of simple bolt system (Figure 1), especially since the bolt system of the G3 rifle represents nothing more than an elegantly designed modification of an inertia bolt.

In an inertia bolt, the projectile momentum, i.e. the impact of the expanding gases, is transferred to the bullet (2) in one direction and to the bolt mass (4) via the cartridge case (3) sliding out of the chamber, in the opposite direction. The recoil spring (5) supports itself agains a mass (6) and returns the bolt mass to its initial position.


Diagram
Figure 1: Transfer of impact to the bolt mass
The ratio between projectile and bolt velocity is just as simple as this of the major components arrangement.

At any moment during barrel time,

(bullet mass + 0.5 x load mass) x bullet velocity = bolt mass x bolt velocity. The cartridge case obturation has been ignored in this case, as it is of no importance in considering the bolt system.

If a weapon with an inertia bolt were to be designed for 7.62 x 51 NATO ammunition, the bolt would have to weigh approximately 14 kg or 31 lbs.

To reduce this weight, much too high for practical purposes, without increasing the corresponding cartridge case extraction velocity (which could cause the cartridge to burst), the HK roller locked bolt is built in two sections. In such a manner that during a certain time, the bolt head, driven by the cartridge case as it slides out, imparts a velocity greater than its own to the bolt head carrier, connected to it by a roller transmission.

Thus the bolt head drives the bolt head carrier by means of an interposed transmission.

The lever transmission is especially well suited for explaining the bolt system of the G3 rifle.


Text Diagram Line Font
Figure 2: Transmission ratios in the G3 Bolt
The distance ratio a:b at the lever (6) is 1:4 in the G3 rifle, for example. With reference to the receiver (9), the path of the bolt head carrier (7) quadruples with respect to that of the bolt head (5). Because of the form locking connection between the two sections of the bolt, both sections travel their different distances in the same amount of time, i.e. during the duration of the effect of the impact (3), so that the velocities of both sections remain in the same ratio as the distance traveled. Bolt head and bolt carrier move longitudinally within the receiver; the lever (6)must support itself in point A to provide the distance and/or velocity ratio between the bolt head and carrier.

Because of this support in the receiver, the impact, (3) transmitted to the bolt head (5) through the cartridge case (4)and occurring while the powder burns, affect the bullet (2) in one direction and simultaneously the bolt head carrier and the receiver in the opposite direction. Meant by receiver or mass, are all parts which are rigidly connected with the receiver, e.g. barrel (1), and trigger assembly housing.


Diagram
Figure 3: Momentum diagram in the G3 bolt.
If the lever ratio a:b = 1:4 is used as the distance and/or velocity ratio for the receiver mass m3, the ratio a:c = 1:3 applies for the distribution of momentum, i.e. 1/4 of the bolt head face momentum drives the bolt head carrier and the remaining 3/4 drives the receiver and the parts rigidly connected to it.

Applied to the bolt system of the G3 rifle, this means the following:

The velocity ratio R = a:b between bolt head and bolt carrier, characteristic of this rifle's bolt system, related to the receiver, permits a reduction of the bolt weight required in a pure inertia bolt to a value which results from the formula



Bolt weight


R2
In order to drive the bolt carrier with the increased velocity during the unlocking period, the G3 bolt system does not have a lever, but an angular transmission, installed symetrically to the axis of the bore, with two rollers as transmission elements.

The ratio of the bolt head carrier with the locking piece travels backward four times faster than the bolt head, and only as long as the rollers move on the inclined surfaces of the barrel extension and locking piece.


Technical drawing Diagram Line Drawing Parallel


Figure 4. Ratio between bolt head and bolt head carrier with locking piece
During the last phase of the bolt's rearward travel, i.e. locking, the bolt head carrier forces the bolt head forward via the locking piece. This causes the laterally projecting locking rollers to engage again. the bolt head comes to rest at the cartridge base and the rollers against the cam surfaces of the locking piece.

Description of the design of the G3 rifle bolt

The vectors are drawn in with the actual angles and true to scale. It is not possible to provide an exact value due to the unavoidable, so-called secondary gas effects, present in all automatic weapons.

In the discussion of momentum, (fig. 3), it was assumed tha the bolt head face momentum was equal to the projectile momentum. However, this is only true in the case of straight cartridges. In the case of a cartridge with a shoulder and a fluted chamber, the interrelations are somewhat more complex. Of course, the momentum principle also remains valid in this case.

Force Vectors (Figs. 5-7):

The gas force (Max. 1.570 kg/460 lbs.) resulting from the burning powder acts upon both the bullet F4 and, within the cartridge case through the cartridge case base, the bolt head face. In addition to this momentum, almost simultaneously a second impact, F5, is created which acts between the shoulder of the chamber andthe shoulder of the cartridge case because of the fluting in the chamber. While the surface acted up0on by the gas is the entire shoulder surface, only the projection of this surface on the cartridge case base is of importance for the amount of momentum in the direction of the axis of the bore. with the 7.62mm x 51 NATO cartridge, this surface happends to be the same as the caliber surface.

The bolt head force, F1, is transferred equally to both locking rollers. the force acting upon each roller is again divided by means of the control angle 22.5 degrees and the recess angle of 50 degrees. Force F2 acts upon the receiver in the direction of the buttstock, while F3 acts upon the bolt in the same direction. Force F2 counteracts cartridge case shoulder force F5. This produces the resulting force F6 (Fig. 7). The trnasverse forces of F2 and F3 (Fig. 6) are absorbed by the receiver and the bolt. The symmetrical arrangement prevents one-sided forces from occurring.

The recoil of the G3 rifle is comprised of two almost equally great impacts. The receiver impact is followed after approx. 30 -40 ms by the buffer impact caused by the bolt. Between them is the cocking phase of the recoil spring, which also exerts a pushing effect of approx. 10 kg (22 lbs.) upon the shoulder. The overall recoil is therefore very well balanced.

F1 = Bolt Head Face ForceF4 = Bullet Force
F2 = Receiver ForceF5 = Cartridge Shoulder Force
F3 = Bolt ForceF6 = Resulting Maximum Force


Technical drawing Diagram Line art Line Drawing
Figure 5: Diagram of forces
Diagram Technical drawing Drawing Parallel Plan
Diagram 6: The Distribution of forces on the locking roller.
Line Text Diagram Font Parallel
Figure 7: Resulting maximum force accelerating the receiver towards the shoulder during gas development.
In summary, the following characteristics of the bolt system of the G3 rifle result from the previously mentioned interrelations:

1. The advantages of the simple inertia bolt are retained, in particular the fact that only the pre-determined distribution of momentum and the area of the gas force curve throughout the time are of importance for the recoil velocity of the bolt. this provides very good adaptability to all types of ammunition of the same caliber, bullet weight and velocity without the same adjusting elements in order to compensate for the shape of the gas force curve.

2. The low extraction velocity most practical for the cartridge case is ensured by the physical and design principles, providing extremely secure cartridge support.

3. The movement sequence of the bolt assembly and the receiver follows the gas pressure sequence without any delay. the uniform, play-free commencement of all movements of the bolt parts and receiver avoids sudden, uncontrollable impacts.

4. The bolt does not make any rotating or tilting movements when opening or closing.

5. The bolt parts are arranged symetrically to the axis of the bore. The roller contact poins are only at a small lateral distance from the axis of the bore.

6. The sequence of the reaction force is uniform and without distinct peaks of force.

7. Because the cartridge case pushes and does not have to be pulled, extractor strain is limited to ejection.

Points 3 - 6 contribute to the extremely high accuracy of the rifle.

It should be emphasized again that this type of bolt is a transmission with angular ratio which, on the one hand, considerably reduces the rearward movement of the bolt head to provide secure support for the cartridge case, and which, on the other hand, distributes the bolt head face momentum on bolt and receiver so favorably that the functioning parts receive optimum drive energy.

The friction occurring during the sequence of movements is negligible with respect to the bolt function in conjunction with the gas pressure sequence.

Cartridge case obturation, the greatest uncertainty factor in every automatic weapon, is reduced so much by the introduction and further development of the fluted chamber and has become uniform for all types of cartridge cases, including lacquered steel cases, that operation is reliable in every situation, even under the most adverse firing conditions.

Heckler & Koch, GmbH 1970

Note to the reader: If you have gotten this far, then you obviously have some serious interest in the operating principles of the roller locked automatic firearms of HK.

Bravo

 
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#43 ·
HK explains it better
Technical Engineering Detail of the G3
The Roller Locking System in Detail



The G3 Automatic rifle has often been described in numerous German and foreign military and weapons journals.

Generally, the operation of the bolt system, the basis of most other small arms of the HK weapons family was only treated briefly, and many times superficially. This can be the cause of misunderstandings, especially if a delayed inertia bolt is spoken of.

As the leading manufacturer, we feel that the time has come to depict the bolt system of the G3 rifle in such a manner that, in addition to the circle of knowledgeable weapons experts, it can also be understood by technically interested weapons enthusiasts, without neglecting technical and physical accuracy. Numerous tests confirm the validity of the theoretical principles described below.

Let us assume it is known that the simplicity and ruggedness of automatic weapon bolts, comprised only of a mass and a spring cannot be surpassed.

For this reason, our discussion should begin with this type of simple bolt system (Figure 1), especially since the bolt system of the G3 rifle represents nothing more than an elegantly designed modification of an inertia bolt.

In an inertia bolt, the projectile momentum, i.e. the impact of the expanding gases, is transferred to the bullet (2) in one direction and to the bolt mass (4) via the cartridge case (3) sliding out of the chamber, in the opposite direction. The recoil spring (5) supports itself agains a mass (6) and returns the bolt mass to its initial position.


Diagram
Figure 1: Transfer of impact to the bolt mass
The ratio between projectile and bolt velocity is just as simple as this of the major components arrangement.

At any moment during barrel time,

(bullet mass + 0.5 x load mass) x bullet velocity = bolt mass x bolt velocity. The cartridge case obturation has been ignored in this case, as it is of no importance in considering the bolt system.

If a weapon with an inertia bolt were to be designed for 7.62 x 51 NATO ammunition, the bolt would have to weigh approximately 14 kg or 31 lbs.

To reduce this weight, much too high for practical purposes, without increasing the corresponding cartridge case extraction velocity (which could cause the cartridge to burst), the HK roller locked bolt is built in two sections. In such a manner that during a certain time, the bolt head, driven by the cartridge case as it slides out, imparts a velocity greater than its own to the bolt head carrier, connected to it by a roller transmission.

Thus the bolt head drives the bolt head carrier by means of an interposed transmission.

The lever transmission is especially well suited for explaining the bolt system of the G3 rifle.


Text Diagram Line Font
Figure 2: Transmission ratios in the G3 Bolt
The distance ratio a:b at the lever (6) is 1:4 in the G3 rifle, for example. With reference to the receiver (9), the path of the bolt head carrier (7) quadruples with respect to that of the bolt head (5). Because of the form locking connection between the two sections of the bolt, both sections travel their different distances in the same amount of time, i.e. during the duration of the effect of the impact (3), so that the velocities of both sections remain in the same ratio as the distance traveled. Bolt head and bolt carrier move longitudinally within the receiver; the lever (6)must support itself in point A to provide the distance and/or velocity ratio between the bolt head and carrier.

Because of this support in the receiver, the impact, (3) transmitted to the bolt head (5) through the cartridge case (4)and occurring while the powder burns, affect the bullet (2) in one direction and simultaneously the bolt head carrier and the receiver in the opposite direction. Meant by receiver or mass, are all parts which are rigidly connected with the receiver, e.g. barrel (1), and trigger assembly housing.


Diagram
Figure 3: Momentum diagram in the G3 bolt.
If the lever ratio a:b = 1:4 is used as the distance and/or velocity ratio for the receiver mass m3, the ratio a:c = 1:3 applies for the distribution of momentum, i.e. 1/4 of the bolt head face momentum drives the bolt head carrier and the remaining 3/4 drives the receiver and the parts rigidly connected to it.

Applied to the bolt system of the G3 rifle, this means the following:

The velocity ratio R = a:b between bolt head and bolt carrier, characteristic of this rifle's bolt system, related to the receiver, permits a reduction of the bolt weight required in a pure inertia bolt to a value which results from the formula



Bolt weight


R2
In order to drive the bolt carrier with the increased velocity during the unlocking period, the G3 bolt system does not have a lever, but an angular transmission, installed symetrically to the axis of the bore, with two rollers as transmission elements.

The ratio of the bolt head carrier with the locking piece travels backward four times faster than the bolt head, and only as long as the rollers move on the inclined surfaces of the barrel extension and locking piece.


Technical drawing Diagram Line Drawing Parallel


Figure 4. Ratio between bolt head and bolt head carrier with locking piece
During the last phase of the bolt's rearward travel, i.e. locking, the bolt head carrier forces the bolt head forward via the locking piece. This causes the laterally projecting locking rollers to engage again. the bolt head comes to rest at the cartridge base and the rollers against the cam surfaces of the locking piece.

Description of the design of the G3 rifle bolt

The vectors are drawn in with the actual angles and true to scale. It is not possible to provide an exact value due to the unavoidable, so-called secondary gas effects, present in all automatic weapons.

In the discussion of momentum, (fig. 3), it was assumed tha the bolt head face momentum was equal to the projectile momentum. However, this is only true in the case of straight cartridges. In the case of a cartridge with a shoulder and a fluted chamber, the interrelations are somewhat more complex. Of course, the momentum principle also remains valid in this case.

Force Vectors (Figs. 5-7):

The gas force (Max. 1.570 kg/460 lbs.) resulting from the burning powder acts upon both the bullet F4 and, within the cartridge case through the cartridge case base, the bolt head face. In addition to this momentum, almost simultaneously a second impact, F5, is created which acts between the shoulder of the chamber andthe shoulder of the cartridge case because of the fluting in the chamber. While the surface acted up0on by the gas is the entire shoulder surface, only the projection of this surface on the cartridge case base is of importance for the amount of momentum in the direction of the axis of the bore. with the 7.62mm x 51 NATO cartridge, this surface happends to be the same as the caliber surface.

The bolt head force, F1, is transferred equally to both locking rollers. the force acting upon each roller is again divided by means of the control angle 22.5 degrees and the recess angle of 50 degrees. Force F2 acts upon the receiver in the direction of the buttstock, while F3 acts upon the bolt in the same direction. Force F2 counteracts cartridge case shoulder force F5. This produces the resulting force F6 (Fig. 7). The trnasverse forces of F2 and F3 (Fig. 6) are absorbed by the receiver and the bolt. The symmetrical arrangement prevents one-sided forces from occurring.

The recoil of the G3 rifle is comprised of two almost equally great impacts. The receiver impact is followed after approx. 30 -40 ms by the buffer impact caused by the bolt. Between them is the cocking phase of the recoil spring, which also exerts a pushing effect of approx. 10 kg (22 lbs.) upon the shoulder. The overall recoil is therefore very well balanced.

F1 = Bolt Head Face ForceF4 = Bullet Force
F2 = Receiver ForceF5 = Cartridge Shoulder Force
F3 = Bolt ForceF6 = Resulting Maximum Force


Technical drawing Diagram Line art Line Drawing
Figure 5: Diagram of forces
Diagram Technical drawing Drawing Parallel Plan
Diagram 6: The Distribution of forces on the locking roller.
Line Text Diagram Font Parallel
Figure 7: Resulting maximum force accelerating the receiver towards the shoulder during gas development.
In summary, the following characteristics of the bolt system of the G3 rifle result from the previously mentioned interrelations:

1. The advantages of the simple inertia bolt are retained, in particular the fact that only the pre-determined distribution of momentum and the area of the gas force curve throughout the time are of importance for the recoil velocity of the bolt. this provides very good adaptability to all types of ammunition of the same caliber, bullet weight and velocity without the same adjusting elements in order to compensate for the shape of the gas force curve.

2. The low extraction velocity most practical for the cartridge case is ensured by the physical and design principles, providing extremely secure cartridge support.

3. The movement sequence of the bolt assembly and the receiver follows the gas pressure sequence without any delay. the uniform, play-free commencement of all movements of the bolt parts and receiver avoids sudden, uncontrollable impacts.

4. The bolt does not make any rotating or tilting movements when opening or closing.

5. The bolt parts are arranged symetrically to the axis of the bore. The roller contact poins are only at a small lateral distance from the axis of the bore.

6. The sequence of the reaction force is uniform and without distinct peaks of force.

7. Because the cartridge case pushes and does not have to be pulled, extractor strain is limited to ejection.

Points 3 - 6 contribute to the extremely high accuracy of the rifle.

It should be emphasized again that this type of bolt is a transmission with angular ratio which, on the one hand, considerably reduces the rearward movement of the bolt head to provide secure support for the cartridge case, and which, on the other hand, distributes the bolt head face momentum on bolt and receiver so favorably that the functioning parts receive optimum drive energy.

The friction occurring during the sequence of movements is negligible with respect to the bolt function in conjunction with the gas pressure sequence.

Cartridge case obturation, the greatest uncertainty factor in every automatic weapon, is reduced so much by the introduction and further development of the fluted chamber and has become uniform for all types of cartridge cases, including lacquered steel cases, that operation is reliable in every situation, even under the most adverse firing conditions.

Heckler & Koch, GmbH 1970

Note to the reader: If you have gotten this far, then you obviously have some serious interest in the operating principles of the roller locked automatic firearms of HK.

Bravo

Yes ROLLER LOCKED.
 
#30 ·
I had a P7 M13 back in the day. Every time I took it to the range someone wanted to check it out. It was like when I used to date Cindy Crawford ... ok so I never dated Cindy Crawford, but anyway, you get the idea.

I let a guy shoot it once at my club. It was an indoor range. The guy finishes shooting, takes a step back, aggressively releases the squeeze cocker, and drops the gun. It bounced of the counter, and spiraled down. The guy standing on the other side of him, who was looking on, snagged the P7 in the air like he was a ninja and set it on the counter.

The guy who just dropped my $700 gun (in early nineties money) turned to me like nothing happened and says, "Boy, that gun really heats up."
 
#37 ·
Moments ago I configured my new P7 online with the manufacturer, a pretty stripped down version at that, for only $2,850. Then I tricked out another, and that one would run me $4,070.

I think I'll order ten of each!!!

(just look at what happens to my schnoz when I fib like that ➡)
Image


But seriously, the H&K P7 family, even the double stack P7M13, just didn't and still doesn't possess any features that I find useful or would want to spend the extra money on - particularly the high priced magazines (e.g., P7M13 mags bring well over $400 each). Even with the addition of the modern "enhancements" offered on these aftermarket renditions, which are quite expensive (e.g., the optic cut slide option will add an additional $1,000 to the cost of the pistol), it's still the same squeeze cocker gas delayed blowback action, that IMHO doesn't offer any more efficient or safer operation than the standard tilting link barrel/manual safety/decocker/hammer/striker fired designs that are in current use nearly everywhere today.

Considering the lack of any innovation, I consider this new P7 offering to be on par with a high priced decked out P80 clone of a Glock; in this case, a revenue generator with a $4,000+ price tag that's obviously been specifically created to vacuum deep pockets.

I think this new P7 will go the way of the *new Automag pistols, which works something like this; first, the crowds are impressed with pre production renderings and images of a new (insert: your choice), then people line up with their deposit money, then they wait...and wait, and wait some more, then the manufacturer does a small production run to get the original depositors off their back, which causes them to run out of money so they have stop production again until enough deposit funds come in to do another small production run to placate that last set of depositors, then have the next group of depositors wait months as the manufacturer addresses and corrects unexpected manufacturing, engineering, or material failures, etc.

No thanks. I went through that noise with ARES Defense (now FLIGHTLITE Industries) and the original Shrike BF upper that I had a deposit on - for over 10 years...
Image
 
#39 ·
I repeat, mine did not get significantly hot at my rate of fire.
The reason I sold it - and glad to get my money back at the time when it was a regular production item at a regular production price, sob, sniff - was because i had to shoot it all the time to keep my squeeze cock reflex in place. Which made me miss my conventional guns.

A coworker fell in love with the type, bought a P7, traded it for an M8, and then for a M13.

I see a clone lab drawing of a compensated gun along the lines of the Graygun, which I thought an intriguing design. Another thousand bucks.
 
#40 ·
I had a P7 what feels like a lifetime ago.

I liked it. It did get hot when fired other than casually. I read that the German police qualified rather leisurely compared to what we would do stateside.

I considered buying 2 new P7M8 pistols for duty. One primary, one secondary. HK dropped them as a catalog item and the armorer course for it so it was a no go for my PD.

I the end it worked out for the best.
 
#41 ·
I am a fan of the p7. I have had quite a few 9mm variants over the years. I wanted to love the m13 but the grip just doesn’t fit my hand. It’s too wide for my bony hand, and it hurts to shoot a couple of mags. P7pro is offering a light weight slim version of the m13. It’s supposed to feel like an m8 and still takes a standard m13 mag. It weighs less than a g19! What?! lol.. The heating issue has supposedly been addressed. It should behave like any other pistol in this regard according to p7pro. I ordered one with threaded barrel and suppressor height sights, which I have always wanted for a p7. I asked about the option of non-railed frame, but it would be cost prohibitive at this point. I am pretty excited about this purchase albeit it will take a while to take delivery. P7 is my favorite pistol of all time and I am happy to see p7pro is bringing it back to life.