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Old June 11, 2015, 03:38 PM   #1
sslog1
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American Arms PX-22 Ejection problems

Been having ejection problems. After gun is fired it is recocked but the spent case is not ejected. If you manually pull the slide back it will eject the spent case properly. Any suggestions.
Thanx
Stan
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Old June 12, 2015, 09:18 AM   #2
usp9
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Is this on every round in the magazine? If the slide cycles, what's happening to the next round? Is the chamber cleaned pretty well?
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Old June 12, 2015, 10:01 AM   #3
dogmush
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Not ejected? Or not extracted?
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Old June 16, 2015, 08:31 PM   #4
sslog1
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Quote:
Originally Posted by usp9 View Post
Is this on every round in the magazine? If the slide cycles, what's happening to the next round? Is the chamber cleaned pretty well?
It happens on every shot. Evidently the extractor does not grab the case, therefore cannot eject the spent round. Changed the extractor and spring. still no good. Gun is clean. I am at my wits end. I am a graduate mechanical engineer, although a long time ago so I understand something about mechanics.

Stan
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Old June 16, 2015, 08:40 PM   #5
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Quote:
Originally Posted by dogmush View Post
Not ejected? Or not extracted?
Spent round is not extracted nor ejected. It stays in the chamber. If I operate the slide by hand the spent case will be extracted and ejected. This happens on every round. It almost appears that the extractor does not engage the rim sufficently when the gun is fired. I don't know why it doesn't jam trying to feed the next cartridge but the hammer is getting cocked.

Stan
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Old June 17, 2015, 02:19 PM   #6
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So what you have is a Failure to Extract. the ejection process seems to be fine (as in if the case comes out of the chamber, it'll get kicked out of the gun.)

The PX-22 is a straight blowback PPK look alike, is it not? That means that when fired it's trying to extract a case that has a bit of pressure on it, holding the chamber sealed. It sounds as if, for some reason, the friction of the case on the wall of the chamber is too high, and the extractor is slipping off instead of gripping the rim.

What to the rims of your spent cases look like? Is there a heavy extractor mark?

Also what does the inside of your chamber look like? Heavy machining marks? Anything inthere that could grab the expanded case is likely to cause a problem.

Lastly is the gun new? Or new to you? has it always done this or did it just start?
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Old June 17, 2015, 05:42 PM   #7
MikeJackmin
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I can imagine two possibilities.

The first is that the chamber is either very rough, or ringed. The fired case expands into these defects and does not budge, and it the case doesn't budge, then the slide is not going to move either (in a simple blowback design, the empty case is the only thing pushing the slide back). This explains why you're not left with a double feed.

The second is that the case begins to extract normally, but something keeps the slide from going all the way back. Something that binds under pressure, but which does not bind when operated by hand, or an over-strong spring, or weak ammo. Maybe the bore diameter is too large and you never get sufficient pressure. This would also explain the lack of a double feed.

Is the slide coming back at all?
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Old June 17, 2015, 10:09 PM   #8
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With how many brands of ammo have you experienced this? Any of the "hotter" ones, like MiniMags?

Most of these little blowback pistols chambered in .22LR are very stiffly recoil-sprung; this is to protect the slide from the forces it absorbs during recoil. Because of the wide range of power levels in .22LR ammo, it has to be strong enough to "ride out" the hotter stuff. The downside of being strong enough for that stuff, like MiniMags and Stingers, is that the weaker "bulk" stuff, such as Winchester Super-X or Remington Golden Bullets, doesn't have the oomph to oversome that spring.

My FEG AP22, a very similar gun based on the same maker's PA-63, actually demands high-velocity fodder, and it's so inscribed on the magazine.
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Old June 17, 2015, 10:12 PM   #9
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To answer the question posed by MikeJackmin, yes, the slide is coming back, at least enough to re-cock the hammer. So, I'd guess it's not the case that's sticking; it's likely one of the other two possibilities you mentioned: something binding in the gun that's easily overcome by hand-cycling, or weak ammo.
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Old June 17, 2015, 10:43 PM   #10
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Couple three suggestions.

1. Carefully inspect the chamber mouth for firing pin peening dent.

2. Clean the chamber with 0000 Super-fine steel wool wrapped on a bore brush spun in a cordless drill.

3. Completely 'color' a round with a black magic-marker and fire it.
Then inspect the fired case for any unusual scuffing or scrape marks.

4. Dig around in the extractor cut in the barrel with a dental pick and see if there is any packed hard black fouling holding the extractor hook out of full engagement with the case rim.

5. Take the slide off and look for any unusual wear or galling on the hammer cocking surface of the slide.

rc
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