Glock 40 recoil spring?

[sherman123]

I've heard to get desired velocities with the more powerful 10mm loads that it is often recommended to get a 22 lb recoil spring with a Glock 20. Anyone know if the stock Glock 40 recoil spring is sufficient or is there a heavier spring available yet? I don't own a Glock 20 but did recently buy a Glock 40 which I love and intend to shoot heavy loads through.

 

[greenlion]

You are more likely to cause failures to eject than you are improve your velocities much. Theoretically, a stiffer spring could delay the barrel unlocking for a millisecond and increase your velocity by some miniscule amount, but I think reliability trumps that possibility. If you want more velocity out of your 40S&W, the answer is a 10mm.

 

[lpsharp88]

The OP mentions the Glock 40, which is the new long slide 10mm model.

 

[tarosean]

The OP mentions the Glock 40, which is the new long slide 10mm model.

Dont matter, ditch the RSA and put in a gen3 recoil spring/rod conversion kit so you can fine tune exactly what you want.

 

[lpsharp88]

Dont matter, ditch the RSA and put in a gen3 recoil spring/rod conversion kit so you can fine tune exactly what you want.

Sure it does. greenlion said "If you want more velocity out of your 40S&W, the answer is a 10mm". The OP IS talking about a 10mm. I was just pointing that out.

 

[tarosean]

greenlion said "If you want more velocity out of your 40S&W, the answer is a 10mm". The OP IS talking about a 10mm. I was just pointing that out.

I see said the blind man... I didnt read greenlions comment.

 

[Onmilo]

A recoil spring has no bearing on the velocity of a cartridge.

 

[Rodentman]

I've shot many rounds out of my G40 with no issues. I can't speak to the velocity but I have reloaded some toward the max limits. My issue with the gun is the MOS POS aspect which as yet remains unresolved, but the local GS and I are working with the Glock rep toward a solution which I hope gets resolved before Christmas.

 

[greenlion]

Ah. I see what you were referencing now. I haven't kept up with the new model numbers. Thought your were referencing 40S&W.

Like I said, using a different spring to effect barrel unlocking time might get you a miniscule amount of velocity increase. I would say they were going with a stiffer spring to buffer against the pounding of hotter 10mm rounds though, not to increase velocity. You get extra velocity from the powder/bullet combination, not the spring.

 

[GLOOB]

I've heard to get desired velocities with the more powerful 10mm loads that it is often recommended to get a 22 lb recoil spring with a Glock 20. Anyone know if the stock Glock 40 recoil spring is sufficient or is there a heavier spring available yet? I don't own a Glock 20 but did recently buy a Glock 40 which I love and intend to shoot heavy loads through.

Glock 40 slide is lighter than the G20. So yeah. If you were to be shooting loads too hot for a regular spring, you would probably need at least the same weight spring in the G40, if not a little heavier.

I doubt you are going to find a commercial load that is too hot for a G40 stock spring, though. At worst, I'd think you might wear out the stock spring a little faster than normal. At the price of those boutique rounds, you aren't going to notice the cost of a spring every year or two.

A recoil spring has no bearing on the velocity of a cartridge.

Agreed. It might change velocity a few fps, or something. In a recoil-operated pistol, the recoil spring affects the maximum loading it can handle and still function as intended. So changing the spring won't make the ammo shoot faster. It will allow firing of faster ammo, in some cases. Same basic reason why sticking a stiffer spring and a muzzle brake into a 1911 will allow it to shoot 460 Rowland. It's not a stronger chamber that makes the gun into a 460. It's the slower slide movement allowing the hotter ammo to extract, and for the gun to not shake itself loose.

You are more likely to cause failures to eject than you are improve your velocities much.

You will want to increase the spring to fix failures to eject. If your ammo is too hot for your gun (and the gun doesn't blow up), it will fail to extract. Stiffer spring will fix that problem. But if you're at that point, you're usually talking about handloads.

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I've heard to get desired velocities with the more powerful 10mm loads

Probably more accurate to say that to get desired reliability with more powerful ammo, you might want to change to a heavier recoil spring. Shoot it and see.

 

[atblis]

Well

A recoil spring has no bearing on the velocity of a cartridge.

I would have agreed in the not too distant path. Now I am not so sure. With the slow powders, it appears it might give a slight boost in velocity with more consistency in the Glock 20. I've seen a few reports, but I don't know if a statistically significant test was performed.

 

[SDGlock23]

I would say the recoil assembly (RSA) in the G40 MOS is sufficient. I've had several G20 Gen4's and found that the stock Gen4 RSA dampened recoil more than aftermarket 22-24lb springs. Stock Gen4 RSA is the best option.

 

[Onmilo]

I would have agreed in the not too distant path. Now I am not so sure. With the slow powders, it appears it might give a slight boost in velocity with more consistency in the Glock 20. I've seen a few reports, but I don't know if a statistically significant test was performed.

I'm gonna give you a bit of advice if you want to play around with a 10mm and top end heavy bullet loads.
Stay away from Accurate Arms #5 powder.
I blew up an EAA Witness with that stuff and 200 grain FMJ bullets.

 

[sherman123]

Ok thanks everyone. Anyone know how many lbs a stock G40 recoil spring is?