Bought a Gen 4 G20 Today!

[4949shooter]

Gunbug, I'm fairly certain that guy who fixed his G20 issue shooting one handed I believe had failure to extract problems, not fail to feed. I had the same problem with my Gen 3 prior to switching to the 22 pound RSA. Shooting one handed was not a problem with the stock spring. I do believe the frame on my Gen 3 SF model was flexing under the high impulse ammo. The 22 pound RSA solved the problem and it now shoots Underwood 165 grain tmj without a hiccup. As you know I have the 24 pound RSA for my Gen 4.

I might suggest trying some of the same ammo in your Gen 4 with the 24 pound RSA. I know this "testing" is costing you money (as it did me) but I would like to get your gun functioning at least with one full power load. The 165 grain is the best of the best, IMHO.

[redbaron007]

The issues were seen with both the factory RSA and the 24-lb RSA.

I'm posting here to report on what's happening for the benefit of other G20 owners who feel all alone with their issues with nuclear 10mm loads.

I appreciate your efforts to diagnose what's happening and I'm sure I would enjoy shooting with you and your shooting buddy and observing/discussing what is happening.  The truth of the matter appears to be that the G20s, and this is even according to Glock, aren't set up to handle the stronger 10mm loads.  Some have perfect luck with all loads, but many do not.

Consider the report of one G20 shooter whose malfunctions with nuclear 10mm loads disappeared when he switched to one-handed shooting.  That's interesting and might suggest that holding the gun very firmly is contributing to the issues.  I'm only willing to relax my hands so much but maybe I'll try dialing down my grip with some of the next batch of hot Underwood I received last night.

Look at what we're asking the G20 to do -- it's something we don't ask of any other semi-auto pistol that I know of.  We are asking for perfect function across a very wide power range of loads, much more than we see with .45 ACP, 9mm, .40 S&W, etc.

I'll bet that if I shot my 1911s with loads that sizzle 200-300 fps faster than most .45 ACP, I might see similar issues.

Anyway, I don't think we should rush to judgment against Glock.  My pistol will probably function perfectly with a wide variety of quality ammo, just not the really hot stuff.  I'm not surprised because I read and heard about it before I bought the gun.  I'll take my time exploring the available options for handling the nuke stuff and of course will report on any "magic formula" I might come upon (DPM or Sprinco RSA, stronger mag springs, etc.).

When did Glock admit to this?

As 4949shooter stated, try to find at least one full power load....I like the UA 155xtp or 165bjhp.

Good luck at figuring out the concerns.

[GunBugBit]

When did Glock admit to this?

In threads from other forums, such as GlockTalk, Gen 4 G20 owners report trying to get to the bottom of why their guns aren't reliable the hotter 10mm loads, and Glock says they do not test their guns with hotter loads and do not recommend shooting hotter loads.

If they have had a change in their position on this, I am not yet aware of it.