FEEDING

Jesse, I agree that the WW2 era PO8s were built with a stronger recoil spring (2 extra coils) than the WW1 versions, so that they could handle the MP40 SMG ammo. If desired, most lugers can have a WW1 or softer recoil spring installed to function consistently with cheap down loaded ammo, but rather than spend $50 to $100 on this, I'd advise finding a brand of ammo that works and stick with it.