Glock Peening

[918v]

Before I buy that 21 SF, can you guys tell me if Glock 21's peen on the inside of the slide like the 9mm and 40 S&W versions?

[D. Manley]

Before I buy that 21 SF, can you guys tell me if Glock 21's peen on the inside of the slide like the 9mm and 40 S&W versions?

They might over time but I have a (light-springed) G34 and (stock-springed) G21 with no visible peening after several thousand rounds through both. I should mention that neither of these has had any "hot" defensive-type rounds ran through them...range use only which is "probably" a big factor.

[MakeMineaP99]

If you're that worried about it, why not mill down the locking block a few thousands?

[918v]

I was thinking about that, but won't the frame flex and the block impact the slide anyway?

I think this is related to slide velocity and the 45 ACP is pretty mild in that respect.

[MakeMineaP99]

I was thinking about that, but won't the frame flex and the block impact the slide anyway?

I think this is related to slide velocity and the 45 ACP is pretty mild in that respect.

It's possible. The only way to answer your question is to do a FEA (finite element analysis) report on the Glock, unlikely that any one but Glock has one (or pay the coin and have someone model a Glock and do an FEA report).

I've never milled down the locking block on a Glock, it's never been a concern for me. I've read about it from other shooters.

I'm not so sure it is soley a function of velocity. Velocity plays a part, but I think there's more to the equation than that. What leads you to conclude that?

[918v]

I had a Glock 24 to which I mated a KKM 357 Sig barrel. Before the swap, I had fired numerous 40's without issue. After the swap, I observed severe peening after about 200 rounds of 90's at 1800 FPS.

I remember reading somewhere that the 21 does not peen. I just need confirmation from actual owners of the gun.

[sparky241]

Before I buy that 21 SF, can you guys tell me if Glock 21's peen on the inside of the slide like the 9mm and 40 S&W versions?

I havent had any problems with my sf yet but i have only put about 100rds of hp's through it and about 400 rd's of ball ammo

[unclebob]

Just shoot my new 21sf for the first time today about 100rds. It shows a little peening. My 30 shows no peening and all of my 9mm show no peening. The only guns that I really had peening was all of my 40 that I had. Once they get so far they stop. Then I just filled them down. What I have been told it does not hurt anything.

[918v]

So it appears to be an individual gun problem. Some have it, some don't.

[Flexmoney]

I've never known the peening to be a problem ?

[918v]

Put a 357 barrel in a second generation 40 and you'll see...

[Flexmoney]

Well, I wouldn't run that in a two pin frame...

I've seen plenty of peening. Got a pic of what you saw? How bad did it get?

[918v]

I don't have a pic because that was before my digital days, but imagine the peening about 1/16" deep and scoring the hell out of the barrel chamber area.

[WalterGA]

Well, I wouldn't run that in a two pin frame...

I've seen plenty of peening. Got a pic of what you saw? How bad did it get?

There are no two-pin, 2nd gen .40s. Slide speed, of course, does contribute heavily to peening. If one buys a new Glock and immediately uses recoil spring weights that are truly appropriate for the loads/calibers that one is shooting, peening can be either eliminated or mitigated.

Some folks have reported success at filing or milling the locking block. Others have reported that Glock's addressed the issue with redesigned locking blocks. I can guarantee you that peening was never an intentional part of a Glock's design.

[Bogey]

Can someone help out a relatively new to guns guy and explain what peening is?

For some reason I feel safe axing that question here. Felt horrified to axe it elsewhere.


Thanks!

[Flexmoney]

Here you go: http://www.custom-glock.com/peen.html

[Bogey]

Here you go: http://www.custom-glock.com/peen.html


Thank you sir! :thumbsup:

[Hatman1793]

I'm finding it very difficult not to buy a G21SF.

[WalterGA]

Chuck Norris is to Jack Bauer as Barney Frank is to Superman!

[Steve Koski]

I have a fairly recent G35 with 10K rounds through it or so. No peening at all. I think they solved the issue. Glock 40s were the biggest peeners, now it seems to be nil.

I would suspect that a 21SF would be similar.

[TowsonTiger22]

I haven't seen any on mine, but I haven't gotten a chance to put that many round through it.

[PCFlorida]

Many 10's of K's through my old 21 (1st gen?), no peening at all. Factory ammo, reloads, lots of cast (oooh nooo), just keeps on ticking.

Just shoot it and enjoy it :)

[BigSlick]

I've got a lot of rounds thru both 23's.

One (bought used) shows a little peening, the other shows none.

Both are 2nd gen guns without da reinforcement.

If ya worried about it, why not fashin a shok buff of sorts.

Yeah, it a be ghetto, but it might help from beatin ya gun ta hell.

As far as shootin .357 Sig outta a 2nd gen G23, from what I hear, there are some 2nd gen G23's with reinforced frame, but I've never seen one. If I do I might buy it an do some testing, but for anything I've seen so far, the 2nd gen guns work best for me cause I hate crappy finger grooves.

I had a 2½ gen 32 for a while, the lost interest in .357 Sig in Glocks an sold it for what I paid for it cause it only had maybe 3-400 rnds thru it.

Decided .357 Sig a be best left to a 1911 platform or a Sig

[918v]

I'll get one, then. I shoot light stuff anyway, so peening should never become an issue.

[chewy]

Oooh. "Pee-ning." :blush2:

I thought you said something else.

[chewy]

Okay, seriously. I had wear and tear concerns about puttin' a 357 Sig barrel in my G-35. So's I just got one of them controversial, much debated waste of money recoil buffers for a few bucks and it at least eases my concerns much cuase my 357 Sig loads clock out at an average of 1530 fps.

[45auto]

I have a very recent G21 (April 06), and I have not seen any sort of peening.
I'm not sure about the round count but I know I'm over 1k.

[John]

i have a g22 and it was peened when i bought it used, and i just took my dremel took and took the burrs off so the barrel would have a little more clearance, i've had another g22 that did the same thing, and a g17 that didnt have any but was starting to show a little wear to the finish in the area of the slide that touches the locking block.

~john