So I have a C&R bring back PPSH-41. It's a great gun, and always goes bang, but the rate of fire is all over the place, even with new S&B ammo. the internals are mint, and the barrel is new looking inside and shiny.
I am looking for advice from other PPSH-41 owners.
Here is what I notice.
Sometimes it throws the brass 5+ feet in the air. When it does this, the rate of fire is perfect and fast. then it'll thrown some rounds just inches into the air and the rate of fire slows down. It's as if some random bullets have less power, but I know that's not the case with new S&B ammo. Could it be that the bolt is dragging on the round in the drum, or dragging while pulling the empty case out of the chamber? Is this a problem that pops up with drums, but I not with stick mags? I don't own any stick mags.
Same things can happen in semi auto. I'll shoot sometimes, and it throws the brass nice and high and it shoots just one round. Then every now and then a round only shoots a case inches in the air, then 2 rounds will fire with just one trigger pull. As if the bolt didn't go all the way back to get caught.
I'm really not sure what the hell is wrong here. I'm glad the gun runs, but I cant figure it out. Spring, drum, brass vs steel case, etc???
Thank you for any help.