GLOCK CRF or pushfeed?

[R.W.Dale]

In another board an interesting discussion was going on about bullet setback with 357 sig from rechambering and ejecting the same round repeatedly.

I stated that to avoid this I simply manually chamber the 1st round and then drop the slide and reinsert the magazine.

It was then brought up that this could be hard on the extractor (much like the same practice is with a crf rifle) since it has to stretch so far to snap over the rim.

To be completely honest this possibility had never occurred to me. I'd always assumed an automatic pistol push fed rounds untilled just before the slide locked at which point the extractor jumped over the rim of the case into the extraction groove.

So educate me. How does the extractor grab the case?

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[REAPER4206969]

Yes, it's controlled round feed.

Yes, direct chamber loading can chip the extractor hook.

 

[rcmodel]

Very few pistols push feed where the extractor snaps over the rim every shot.

Some that do include the Russian Makarov, HK P7, and German P-08 Luger.

Anything based loosely on the John Browning design, like a Glock, will push the round out of the magazine as it slides up the breach face and under the extractor hook.

rc

 

[Ben86]

Load the gun in a way other than it was designed and you can expect bad things to happen, like a chipped extractor.

Load the magazine, chamber a round, cap the magazine off if you wish.

Set back does happen, but not easily. With good ammo you have to chamber the same round dozens of times before it really starts to take effect.

When loading up I try to look for cartridges that don't appear to have been chambered yet and load those. I also replace my carry ammo once a year.

 

[FIVETWOSEVEN]

I've found that set back happens with .45 ACP, .40 S&W, but 9mm is resistant to it that I just gave up on trying to set back the bullet. I rechambered the same 9mm round over 50 times and it still looked fine. .45 ACP only took about 15 times to be really setback and same with .40 S&W.