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G17 Gen 4 pull weight testing

1496 Views 12 Replies 7 Participants Last post by  Rocky7
Hello all, I read these forums quite a bit and though this is my first post here, I thought I would give direct pull weights using a lyman's for some common connector/trigger spring questions I see a lot of people ask/speculate about.

All Stock glock gen 4 - with (dot connector) - 7.4# avg

If you change from the gen 4 trigger bar (The one with the bump) and put in a gen 3 trigger bar with no bump - 6.#5oz avg

All stock with gen 4 bar, this time just changing out the stock 4# trigger spring to a 6# trigger spring, 7#.05oz avg

Stock glock gen 4 bar + ghost 3.5# connector 6#.9 oz

Gen 3 bar + dot connector + 6# trigger spring 5# 15oz

This was done on my glock that has all polished parts. Surprisingly, they biggest change in pull weight was no doubt the gen 3 trigger bar, even over the connectors. The trigger spring provided roughly a 3 oz trigger drop.

Anyways hopes this answers some questions.
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Hello all, I read these forums quite a bit and though this is my first post here, I thought I would give direct pull weights using a lyman's for some common connector/trigger spring questions I see a lot of people ask/speculate about.

All Stock glock gen 4 - with (dot connector) - 7.4# avg

If you change from the gen 4 trigger bar (The one with the bump) and put in a gen 3 trigger bar with no bump - 6.#5oz avg

All stock with gen 4 bar, this time just changing out the stock 4# trigger spring to a 6# trigger spring, 7#.05oz avg

Stock glock gen 4 bar + ghost 3.5# connector 6#.9 oz

Gen 3 bar + dot connector + 6# trigger spring 5# 15oz

This was done on my glock that has all polished parts. Surprisingly, they biggest change in pull weight was no doubt the gen 3 trigger bar, even over the connectors. The trigger spring provided roughly a 3 oz trigger drop.

Anyways hopes this answers some questions.
Having tested many Glock triggers I have not found one that was polished and had a trigger pull weight of 7# 4oz.
I have not seen a 1# reduction in trigger pull by replacing the Gen 4 trigger with a Gen 3 trigger.
Glock does not have an OEM 4.0# trigger spring, it is 5.5#.
 

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Could you clean up the numbers a bit to be consistent whether in pounds and ounces; decimal pounds; and clarify if those numbers are really decimal or hundredths of an ounce? Thanks! Good work!

EDIT:
For clarification, I checked my Lyman trigger pull gauge. This gauge measures in pounds, then ounces down to the 10th of an ounce. It does not measure in 10ths of a pound or 100ths of an ounce.
 

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Discussion Starter · #4 ·
Having tested many Glock triggers I have not found one that was polished and had a trigger pull weight of 7# 4oz.
I have not seen a 1# reduction in trigger pull by replacing the Gen 4 trigger with a Gen 3 trigger.
Glock does not have an OEM 4.0# trigger spring, it is 5.5#.
I'll post a video shortly showing my exact findings as I use the trigger guage. And you are correct about the trigger spring weights, - Regardless its the stock trigger spring vs the 6#
 

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Thanks - interesting numbers so far.
 

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Your report agrees with nothing I have ever measured. Where are you applying pull gauge pressure on the trigger?

I have put Gen3 trigger bars in Gen4 pistols and Gen4 trigger bars in Gen3 pistols and found NO significant difference in BEFORE and AFTER pull weights.

I have measured the resulting pull in otherwise totally OEM pistols, Gen3 and Gen4, for all four OEM connectors and found NO significant variation in pull from nominal (4.5, 5.0, 5.5, and 8.0-lbf in Gen3, 0.5-lbf greater in Gen4).

I apply my pull gauge at the point on the trigger where my finger applies pressure. That is neither at the middle nor end of the trigger.
 

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Discussion Starter · #9 ·
I've used the lymans many, many times and understand the importance of getting the correct positioning for accurate results. I use this to see what mods, or if any have any affect on the stock trigger pull to measure what people claim vs what is realistic so I know what actually works, vs a waste of money and time in parts. That being said, I just provided a concrete video, and I could post more, but the results will be the same. The trigger gauge is not getting changed to some *better* pull position when I put the gen 3 bar in. I've done more than 40 pulls on each and get the same result non-stop. Trust me, I'd love to run the gen 4 bar because of better alignment over the safety plunger. But results are the results. You can debate it all you like, but I understand the disbelief because this is my first time posting, in this forum. This is my personal experience as shown on what reduces the trigger weight, by how many ounces on each part tested, many times. All glocks are different I'm sure - I was just sharing what my testing found on swapping trigger bars.

(to answer your question, I pull directly in the middle of the trigger where my finger placement would be. Using the gauge at the bottom of the trigger, close to dragging across the bottum of the trigger bar nets almost 2lb lighter results, however its not realistic, as no ones finger is perfectly skinny enough to pull the trigger at the exact bottom of a trigger on a glock.) ymmv.

Also - You said you found no nominal difference between the glock 3 and the glock 4 via connectors and trigger bars, yet theres posts, upon posts of people preferring and noticing quite the difference in the gen 3 pull weights stock vs stock of the gen 4's, a simple search will net this.
 

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...yet theres posts, upon posts of people preferring and noticing quite the difference in the gen 3 pull weights stock vs stock of the gen 4's, a simple search will net this.
What is your point? If you'll read my post with some care, you may notice the statement of measured trigger pulls from all four OEM connectors in Gen3 pistols, followed by the information that pull in Gen4 pistols is greater by 0.5-lbf.

That is THE reason that Gen4 pistols now have a DOT connector, which produces a 5.0-lbf pull in Gen3, to produce Glock's standard 5.5-lbf pull in Gen4.

Or perhaps attribute some degradation of trigger pull to that "bump" on the trigger bar firing pin safety arm. Many do. And just about ALL of them are ignorant of the fact that the bump has ALWAYS been on the trigger bars of ALL generations of Glock .45ACP and 10mm pistols...about 25 years...with no similar evils drawing notice. It sounded like BS...and when all the various combos were assembled and measured that's what it turned out to be.

And I'll just about bet that the point of effective application of your finger force is not in the middle of the trigger.
 

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Hello all, I read these forums quite a bit and though this is my first post here, I thought I would give direct pull weights using a lyman's for some common connector/trigger spring questions I see a lot of people ask/speculate about.

All Stock glock gen 4 - with (dot connector) - 7.4# avg

If you change from the gen 4 trigger bar (The one with the bump) and put in a gen 3 trigger bar with no bump - 6.#5oz avg

All stock with gen 4 bar, this time just changing out the stock 4# trigger spring to a 6# trigger spring, 7#.05oz avg

Stock glock gen 4 bar + ghost 3.5# connector 6#.9 oz

Gen 3 bar + dot connector + 6# trigger spring 5# 15oz

This was done on my glock that has all polished parts. Surprisingly, they biggest change in pull weight was no doubt the gen 3 trigger bar, even over the connectors. The trigger spring provided roughly a 3 oz trigger drop.

Anyways hopes this answers some questions.
My Lyman should be arriving today and I can contribute to this. I have both a Gen 3 and Gen 4 17 with duplicates of the fire control parts so I will add to this later. Both G17's have a low round count and were manufactured recently, the Gen 3 being a mid 2014 pistol and the Gen 4 being test fired last month.

I can tell you neither of mine are above a 7lb pull weight. Where on the trigger were you placing the gauge when testing? The higher on the face you are, the less leverage you have creating a heavier pull. Being that a finger takes up most of the lower part of the trigger face, the closest you can get to an accurate measurement when using a thin bar is placing the gauge near the center of the lower half of the trigger face.

I only mention this because even with the worst machining tolerances possible, I cannot see a trigger pull that heavy unless you intentionally put a NY1 and a Gen 3 unmarked connector in a Gen 4 pistol.
 

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I've used the lymans many, many times and understand the importance of getting the correct positioning for accurate results. I use this to see what mods, or if any have any affect on the stock trigger pull to measure what people claim vs what is realistic so I know what actually works, vs a waste of money and time in parts. That being said, I just provided a concrete video, and I could post more, but the results will be the same. The trigger gauge is not getting changed to some *better* pull position when I put the gen 3 bar in. I've done more than 40 pulls on each and get the same result non-stop. Trust me, I'd love to run the gen 4 bar because of better alignment over the safety plunger. But results are the results. You can debate it all you like, but I understand the disbelief because this is my first time posting, in this forum. This is my personal experience as shown on what reduces the trigger weight, by how many ounces on each part tested, many times. All glocks are different I'm sure - I was just sharing what my testing found on swapping trigger bars.

(to answer your question, I pull directly in the middle of the trigger where my finger placement would be. Using the gauge at the bottom of the trigger, close to dragging across the bottum of the trigger bar nets almost 2lb lighter results, however its not realistic, as no ones finger is perfectly skinny enough to pull the trigger at the exact bottom of a trigger on a glock.) ymmv.

Also - You said you found no nominal difference between the glock 3 and the glock 4 via connectors and trigger bars, yet theres posts, upon posts of people preferring and noticing quite the difference in the gen 3 pull weights stock vs stock of the gen 4's, a simple search will net this.
The only explanation then is either a gauge problem (don't have enough experience with the gauge to even know how possible this is), or an issue with Glock having very loose specifications when machining parts causing variances from pistol to pistol depending on what parts combination ended up in the gun.
 

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I can appreciate everyones time, allthough you need not do this for me, I have an idea of my needs and what can be accomplished, This has got to take up alot of time and energy.
 
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