Are you still having that issue? If so, let me take it to the range, trouble shoot, and allivate the problem for you, no charge. It is not opening the breechblock back enough to get fuly behind the cartridge. The PPU ammo should have addressed that? Let me know as we are not done until your Luger is running correctly... Best, til....lat'r.....GT
BTW, although i don't think it is the problem, the tight fork might be causing a dynamic drag between breechblock and receiver... We can correct... best, til.....lat'r....GT....
