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Old November 11th, 2017, 05:46 PM #1
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M57 ZASTAVA Jamming Woes

Pics will basically tell it all. Matters not surplus or modern factory, this has happened twice before. It's a MUBBA to unstick. Well oiled ect... the last two rounds surplus had light strikes, yes I know commie harder primers.

NOTE the cracked case of the extracted jam.
Since I shot corrosive today I'll tear it down to parade rest, lube reassemble tonight.
Educated thoughts?
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Old November 11th, 2017, 05:51 PM #2
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My first thought is some of the surplus ammo is pretty hot. I've seen split cases in surplus before, but that alone hasn't been a big deal. They're not reloadable cases on my bench.
Hard extraction is a sign of over pressure though.
What do the fired primers look like?
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Old November 11th, 2017, 05:59 PM #3
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Quote:
Originally Posted by j8064 View Post
My first thought is some of the surplus ammo is pretty hot. I've seen split cases in surplus before, but that alone hasn't been a big deal. They're not reloadable cases on my bench.
Hard extraction is a sign of over pressure though.
What do the fired primers look like?
Did it twice with new factory PPU ammo which is loaded down, 1 in 50, no cracks and strikes looked good. I don't remember seeing split cases with it but it could have happened. I'm thinking more of a gun issue over ammo.
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Old November 11th, 2017, 06:43 PM #4
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Quote:
Originally Posted by TargetGrade View Post
Did it twice with new factory PPU ammo which is loaded down, 1 in 50, no cracks and strikes looked good. I don't remember seeing split cases with it but it could have happened. I'm thinking more of a gun issue over ammo.
OK. I get that. What I'm not clear on is exactly when the pistol jams.
i.e. when it's jammed is the case partially extracted like in your pics? Or is that a result of your efforts to un-jam a stuck case?

Is the case is not being fully extracted by the blowback pressure?
Is there maybe a burr or obstruction in the slide channel?
Is it maybe an extractor or ejector issue?

Lots of questions.

I'm not an expert on M57's. I have one to go with my TT-33's and M70A. They're basically all the same and I'm pretty familiar with how they work.

Hope I can help you out somewhat...
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Old November 11th, 2017, 07:32 PM #5
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Quote:
Originally Posted by j8064 View Post
OK. I get that. What I'm not clear on is exactly when the pistol jams.
i.e. when it's jammed is the case partially extracted like in your pics? Or is that a result of your efforts to un-jam a stuck case?

Is the case is not being fully extracted by the blowback pressure?
Is there maybe a burr or obstruction in the slide channel?
Is it maybe an extractor or ejector issue?

Lots of questions.

I'm not an expert on M57's. I have one to go with my TT-33's and M70A. They're basically all the same and I'm pretty familiar with how they work.

Hope I can help you out somewhat...
It comes maybe halfway back after firing, after FORCING closed smooth as silk by hand. Hard stuck, block of wood against protruding barrel stuck is the only way to free. When I reassemble I'm going with white grease instead of Ballistol.
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Old November 12th, 2017, 09:42 AM #6
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Any corrosion or build up in the barrel chamber?
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Old November 12th, 2017, 12:21 PM #7
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Take a look at this video. He had a similar problem and fixed it.

https://www.youtube.com/watch?v=3iIk37CSfzw
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Old November 12th, 2017, 12:40 PM #8
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Take a look at this video. He had a similar problem and fixed it.

https://www.youtube.com/watch?v=3iIk37CSfzw
Nope, not a feed problem, jams on extraction cycle and all I use is FMJ ball ammo.
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Old November 12th, 2017, 12:44 PM #9
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Any corrosion or build up in the barrel chamber?
Nope, looks factory fresh, in fact I think this was unfired when I bought or close to it.
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Old November 12th, 2017, 01:02 PM #10
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Pic three looks like there's surface rust inside the slide.

If so, that gun is dry, dry, dry.

Get the ole girl really wet and see how she performs.

I'm betting lots of lubrication will solve the problem.
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