So my PPSH41 ejects all of it's rounds and goes bang every time, but the rate of fire of the gun is all over the place, and this is with good new S&B ammo. Could this be drum and mag related or something else?
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 more often? It did it still, but not as bad with my stick mag.
Same thing can happen in semi auto. I'll shoot, and sometimes 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, and 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??? I've only shot it with S&B brass cased ammo, but have steel cased RedArmy and PRVI brass cased ammo coming in on Thursday to try out.
I've also been asking this questions on machinegunboards, and somewhere there mentioned their ejector causing a similar issue, so I checked mine. Here is what I found.........
I just now took the spring and rod out of the gun and held the trigger down so I could move the bolt forward and backward freely. When it is all the way back it's sitting level, but as I push it forward slowly it does actually hit the top of the ejector and raise maybe 1/2 - 1mm. Is this normal? I've never seen a gun do this before. Should I take a dremel to the top of the ejector and shave off 1/2mm so it glides over it freely or is this normal?
Thanks for all help and advice