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PPSH-41 not feeding


Got Uzi
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I have a PPSH-41 Im working on and its not feeding from the drum. It fires when the round is in the chamber but not when feeding from an ammunition source. Im waiting on some regular stick mags to come in but does anyone have any ideas?
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Yes it will go full stroke to chamber a round but its loosing bolt velocity somewhere. The bolt is not dragging on the drum as I can leave a round in the chamber then drop the bolt...BANG but if it feeds a round out of the drum, it will fully chamber but go THUD
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You need to mention that you've converted it to 9mm, it makes a difference.

 

Just guessing here but look at the front of the drum where the rounds get pushed out. It's configured for the bottlenecked 7.62x25 cartridge. The straight-walled 9x19 may be catching the mouth of the case on the edge of the opening. If so 30 sec with a Dremel will solve that issue.

 

The other thing to look at is the feed ramp area. Because the larger bullet diameter will cause the cartridge to feed at a steeper angle the 9mm may be slowed down just enough to be a problem and will require a bit more ramp than the 7.62

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The drum may be a bit too high in the gun or someone may have made winding spring pressure in the drum too high causing excessive drag to strip out the round. Try different drums as all stated above. When I bought my gun way back the drums were 10 for 100 bucks so i bought 20. Only around 5 or 6 worked well. The rest needed work..some did not fit in gun, some were extremely loose and wobbled and some the feed lips were bent and the rounds would not feed and release smoothly from the drum. Try sticks too they work much better and the rate of fire is faster and smoother. As noted also above is caliber conversion. 9mm makes feeding more difficult. I have two drums that feed 9mm well the rest are headaches but work in 7.62 well. Also try different recoil spring and also different bolt if no luck as they vary too fitting loose or tight in the receiver. You will get it worked out just takes patience
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Well....I got it to feed from the mags....a couple of them. Appears they will need to be fitted a little bit. Now I have another issue....hows much tension should the rear latch have with the spring? The latch is vibrating forward and let the receiver swing open. Im going to presume it needs to be pretty darn stiff but I want confirmation on this
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They do not need tonbe very tight they just need to lock up firmly And have no up and down slop between upper and lower. Mine was like that and would pop open which is dangerous and also let the bolt move up enough after firing that the empty casing would not hit the ejector correctly causing jams. What i did was remove my serial numbered rear cap off and got another. Then i added someweld to the tab that locks it down and then hand fitted it with a file so when the catch slides into the lower the upper and lower are tight. This made a huge difference on my reliability and the gun runs pretty much 100 percent
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  • 2 months later...

Well I got it working 50% its better but not happy. Polished the chamber as there was some drag from the casing. I also polished the bolt where it picks up the round from the magazine. It was tearing the rim up bad.

 

I did discover that it liked being run dry. Now granted it was 15 degrees outside while testing it. Has anyone else found a PPsH-41 runs better dry?

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  • 3 weeks later...
  • 3 weeks later...

You have to fit stick mags and you have to REALLY fit drums. You'll need many of each to go through to get ones that actually work well. For what it's worth, I now only run stick mags in mine. 100% reliable with those.

 

It absolutely depends from gun to gun and from mag to mag. I have 3 PPSH-41s originals full auto and dozen mags, sticks and drums, and still some sticks are super tight fit, some drums are rattly. Actually when I think about it, most drums I have are loose, they are in general looser than sticks.

However, I have no experience with 9mm conversions (why massacring a Shpagin with filthy 9mm), so I don't know how those mags behave.

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  • 1 month later...
Well I finally got the PPSH-41 back out of the safe and went at it again. Found I was having a slight drag issue from a mild misalignment issue of the receiver pieces when welding. Relieved those issues and it now runs pretty well. Need to beat thefrint sight and get it shooting POA/POI

post-258973-0-73302600-1618449356_thumb.jpeg

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  • 2 weeks later...

Hi Got Uzi,

 

Have you tried the MP-40 mag/magazine insert for 9mm? Evidently it worked for the Germans. I've one but have never tried to make it work.

 

Good to see yours is alive!

 

Grasshopper

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  • 1 month later...

I'm a bit late to the game, and new to the forum, but I have a lot of experience with the PPSH-41 (yes I own one). All the comments above are relevant and true, especially fitting the drums to the gun. When the guns were made, each one had one or two drums matched at the factory. Of course, during the war and after, all the stuff got mixed up. What I found interesting is that drums with the same factory marking (mine is #3) seem to fit and function well. I may have to lightly shave off a tiny bit of metal on the sides, (same for the stick mags) but if you go slow, the fit can be quite nice. This is probably how they were fitted originally.

 

The conversion to 9MM changes everything. As loosy goosy as those guns were, the headspace magazine fit to feed ramp were actually very well spec'd.

 

I will note also that over time the trigger assembly parts do wear and at some point, your gun may (on full auto) shoot two or three then catch on the sear. Stockpile trigger assemblies and bolts if you can.

 

As far as ammo, i got lucky and was able to stockpile tons of surplus 7.62 x 25 when it was cheap. Never had a misfire.

 

Regarding the back receiver latch, it's either engaged or not. See if yours hangs up on the buffer. It does not need to be tight as the spring holds the latch in place.

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  • 10 months later...

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