I'm pretty sure I know the answer already because of the extractor and the ejector but I would like to know if it is possible to convert a 26 to a 33 with just a barrel and mag change. I had an employee at my local gun store tell me all I need is a barrel (Lone Wolf) and a mag. When I doubted and questioned him the emplyee next to him said 'he's been to Glock School'. So I thought 'what do I know?' I realize feeding it .357sig is costly but would like to have the option.
Glock 26 conversion to .357sig
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crabangle
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I'm pretty sure I know the answer already because of the extractor and the ejector but I would like to know if it is possible to convert a 26 to a 33 with just a barrel and mag change. I had an employee at my local gun store tell me all I need is a barrel (Lone Wolf) and a mag. When I doubted and questioned him the emplyee next to him said 'he's been to Glock School'. So I thought 'what do I know?' I realize feeding it .357sig is costly but would like to have the option.
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The gun store employee's comment would be correct if you were wanting to convert a G27. But since the breech face on your gun is only wide enough for a 9mm case head, you will never fit a .40 / .357 SIG case head into that slide.
For you to convert your gun, you will need a complete slide for a G27 or G33 and barrel in the appropriate caliber.
There are a number of complete top ends listed on Gunbroker. But the starting prices are so high, you would probably be better off just spending a little more money and getting another complete firearm.
For you to convert your gun, you will need a complete slide for a G27 or G33 and barrel in the appropriate caliber.
There are a number of complete top ends listed on Gunbroker. But the starting prices are so high, you would probably be better off just spending a little more money and getting another complete firearm.
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There you have it. That 'glock school' must've been in China or something.
1) Caliber conversions using drop-in parts can be achieved either laterally (like .40 S&W to .357 Sig or 10 mm to 9X25 Dillon) or downward (like .45 ACP to 10 mm or .40 S&W to 9 mm).
Like Jakk said, you're not going to stuff a .40 S&W barrel into a 9 mm slide. But a caliber conversion barrel with the outside specs of a .40 S&W and the inside specs of a 9 mm, may just work for you.
Keep in mind that the footprint of both calibers, the original and the substitute caliber, cannot be too dissimilar for the same platform to handle them both. A G21 .45 ACP is not going to convert to 9 mm using simple drop-in parts, as the two footprints are too dissimilar for the .45 ACP platform to handle.
I did successfully convert my own G21 to 10 mm, but it took some tweaking of ammo types and RSA's to arrive at a 100% reliable rig. But sixteen shots of true .357 magnum power (1600 fps and 767 ft/lbs.) was well worth the effort!
2) .357 Sig is an impressive cartridge--especially the amped up stuff!
clydog's right about the .40's convertibility. You can shoot .357 Sig with an OEM Barrel swap, and 9 mm with a drop-in conversion barrel.
Even more convertible would be say, the Glock 20 or Glock 21... Consider some of the unicorn calibers and their impressive statistics, in addition to .40 S&W and .357 Sig:
.45 Super
.460 Rowland
.40 Super
10 mm
9X25 Dillon
All of the above offer extreme performance for your autoloader! :wow:
--Ray
P.S. Attached are two pics of my G21 10 mm...
Also .40 and .357 barrels are larger in diameter than 9mm barrels, and as such would not pass through the muzzle end of the slide.
That's why you need a "conversion barrel" to shoot 9 from a .40 glock, and not just a factory barrel in the desired caliber.
I agree wholeheartedly and that is why I have shot more 9 mm through my G27 than .40 caliber with my LW 40-9 conversion barrel. So far, 720 rounds of 9 mm vs 632 rounds of .40 caliber. Plus, shooting 9 mm through my G27 has saved me $72 in ammo costs.
Those XGRIPS you asked about in the other thread also work on the G17/G19 magazines...
--Ray
I know, I've thought about getting some G17/G19 magazines too. Darn Glocks give you way too many choices.Those XGRIPS you asked about in the other thread also work on the G17/G19 magazines...
--Ray
:wavey:
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304 Posts
So my question is can I use a Lone Wolf 4" .357 sig barrel in my gen 4 27? I realize the barrel will project .5" further than my existing .40 barrel but will it function 100%? Any comments on the Lone Wolf barrels? quality?
Other than ammo, what else do I need? Will my G27 .40 S&W mags work fine with the .357 sig ammo?
Is there any negative long term impact on my G27?
Thx for help with this.
4" .357 sig barrel for $99
http://www.midwayusa.com/product/922609/lone-wolf-barrel-glock-32-357-sig-1-in-16-twist-402-stainless-steel
Other than ammo, what else do I need? Will my G27 .40 S&W mags work fine with the .357 sig ammo?
Is there any negative long term impact on my G27?
Thx for help with this.
4" .357 sig barrel for $99
http://www.midwayusa.com/product/922609/lone-wolf-barrel-glock-32-357-sig-1-in-16-twist-402-stainless-steel
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4,550 Posts
I am pretty sure that barrel will not work/it will get stuck, If I remember correctly the lugs are different. Lust like a 17 barrel gets stuck in a 26.
EDIT- this barrel should work being a G32 barrel.
Lone Wolf Quality wise- I use a stock length Glock 20 barrel in my 20 with my reloads (plated bullets). Its been great, they have tighter chambers but I have had zero problems with it. I also owned a .40 conversion for 10mm and a 9x25 Dillon barrel from them, all were problem free. Only thing that bugs me is the goofy symbol on the barrel hood, but whatever I only drop the barrel in just before going to the range.
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The barrel you linked from Midway is a Glock 32 barrel and it may actually work. The ones that get stuck are the full size barrels.
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A Glock subcompact (uses 3.4-inch barrel) will work fine with a Glock compact (4-inch) barrel. The Lone Wolf should be no exception, although I never use any aftermarket stuff on my Glocks except night sights. Glock OEM barrels are not all that expensive.
Note: Standard (4.5-inch), Tac/Prac (5.3-inch), and Long Slide (6-inch) barrels will not work in a compact or subcompact model.
The .40 SW mags seem to function OK with .357 SIG ammo in them, even though the surface profile of the mag follower against the cartridge case is noticeably different between the .40 SW and the .357 SIG magazines.
I have a G31. I'll probably get a Glock G33 barrel soon to put in my G27, because I like .357 SIG better than any other auto pistol round. I expect no problems.
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4,550 Posts
Here you go, this is a standard 32 barrel and it states that it is good to go in a G27.
http://www.glockmeister.com/G32-GLOCK-Factory-Barrel/productinfo/G8665/
Your Lone Wolf barrel you linked should be good to go. I used to run 357 sig out of my 22 and I never changed mags, never a problem.
http://www.glockmeister.com/G32-GLOCK-Factory-Barrel/productinfo/G8665/
Your Lone Wolf barrel you linked should be good to go. I used to run 357 sig out of my 22 and I never changed mags, never a problem.
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304 Posts
Thx for the info, gentlemen.
What do you guys think about a slightly heavier recoil spring assembly? Logic says if the high velocity 125 gr .357 sig projectiles develop 600 lbs-ft of energy, the recoil impulse versus the .40 S&W cartridge has to be more slightly intense.
Is there options for the recoil spring assembly for my G27?
I see glockmeister sells/references the same recoil assembly for the models 26,27,33, and 39.
Maybe my thinking is off but if you're developing 450 lbs-ft energy with a .40 round, versus 600 lbs-ft with a 1500 fps 125 gr .357 sig round.....surely the sig recoil is markedly greater, or more recoil energy to absorb. Instead of battering the slide. Maybe try a recoil assembly for the 29, 30, 36 group of pistols?
What do you guys think about a slightly heavier recoil spring assembly? Logic says if the high velocity 125 gr .357 sig projectiles develop 600 lbs-ft of energy, the recoil impulse versus the .40 S&W cartridge has to be more slightly intense.
Is there options for the recoil spring assembly for my G27?
I see glockmeister sells/references the same recoil assembly for the models 26,27,33, and 39.
Maybe my thinking is off but if you're developing 450 lbs-ft energy with a .40 round, versus 600 lbs-ft with a 1500 fps 125 gr .357 sig round.....surely the sig recoil is markedly greater, or more recoil energy to absorb. Instead of battering the slide. Maybe try a recoil assembly for the 29, 30, 36 group of pistols?
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4,550 Posts
You can certainly try that if you want to. Remember that Glock's chambered in .45 and 10mm come with the same 17lb spring as 9mm and 40. You will need to buy a Glock 27 specific guide rod/spring. Wolf makes quality guide rod/spring combos for a fair price. I run a 22lb spring/rod combo in a Glock 20, but that is launching a 180grn bullet a little over 1200 FPS. I am not sure it is needed with 357 sig but its your gun, tinker as you wish. I would go with a 20lb combo if I was inclined (which I may not be) to put one in a 357 sig.
http://www.gunsprings.com/index.cfm?page=items&cID=1&mID=5#123
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The calculation of recoil is complex and involves weapon weight and the effects that the shooter has on absorbing the recoil impulse. But assuming everything else is held more or less constant while looking only at the ballistics of the rounds being compared, the greatest contributor to the recoil impulse calculation is the momentum of both the bullet and the propellant gases. Concentrating only on the effect from the bullet, bullet momentum is proportional to bullet mass times bullet velocity. That is very different from bullet energy, which is proportional to bullet mass times bullet velocity times bullet velocity. Judging recoil from the muzzle energy figures leads to grossly incorrect results because the momentum calculation is proportional to the velocity, while the energy calculation is proportional to the velocity squared.
It is very common to have a loading whose light bullet at high velocity has much higher energy, but less momentum imparted to the bullet when compared to another loading with heavier bullet and lower velocity. In that case, the second loading will likely have the greatest recoil impulse even though it has the lower energy, because its imparted momentum is greater.
Let's use a couple of examples with data from the Ballistics By The Inch Website, using data from a 4-inch barrel.
.357 SIG, 125 gr. Corbon:
Muzzle velocity 1468 fps measured (Muzzle energy 598 ft-lbf)
.40 SW, 180 gr. Federal Hydra-Shok:
Muzzle velocity 1022 fps measured (Muzzle energy 417 ft-lbf)
The ratio of muzzle momentum for these two cartridges is calculated very simply as:
(velocity of .357 x mass of .357) / (velocity of .40 x mass of .40) =
(1468 x 125)/(1022 x 180) = 0.997
If both rounds have the same muzzle momentum, the ratio above will be 1.0.
The actual result indicates that the momentum of both of these rounds from a 4-inch barrel is essentially identical (almost a ratio of 1.0). If we split hairs, in fact the .357 bullet has slightly less momentum (and therefore, slightly less recoil) than the .40 bullet. This is in spite of the .357 SIG bullet having 43 percent greater muzzle energy than the .40 SW bullet!
You presume to understand the engineering design requirements for the Glock subcompacts better than Glock! For me, even though I've been an engineer for 40 years, I would not be as bold.
As shown earlier, any reliance on muzzle energy as a measure of the recoil impulse or velocity is incorrect and will lead to very wrong conclusions.
As an aside, you are not going to see 1500 fps from a 125 gr .357 SIG bullet coming out your G27's 3.4-inch barrel, or even the G32's 4-inch barrel. But from the full-size 4.5-inch barrel of a G31 it's certainly possible. I get 1565 fps from my G31 with Underwood ammo.
Trust that Glock's engineers know what they are going. The subcompact Glocks (non-10mm and non-.45) have been around for almost 18 years, all of them using the same RSA without requiring customer enhancement for safe and reliable and durable operation.
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Yeah Mike, my assertions were rather blind guesses based on little factual basis. I actually thought about what I wrote above after the fact, and the fact that Glock uses the same recoil assembly in the 26, 27, 33 and 39 makes a definite point.
You clearly have a very good understanding on the dynamics of recoil....thanks for your input.
You clearly have a very good understanding on the dynamics of recoil....thanks for your input.
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