Couple problems happening here

[Lugerdoc]

I believe that the "U" shaped "problem" is just an optical illusion caused by the angle that the photo was taken. So long as this part of the received doesn't extend into the extractor cut of the barrel, it should be OK. Too many of you chasing Zebras. Unually when the case mouth of a spent case is crushed, it's a result of the toggle returning faster than the case can eject. There are several possible cause of this, but with the lack of HO after the last round, I would postulate that the recoil spring is too strong for the ammo being used. Cutting a link or two off of the current recoil spring, should solve this problem. Of course it would be a good idea to also check the condition of the extractor and ejector, which can also delay case removal. TH