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I am going to play around with this MP 842 again this weekend. Stay tuned.I finally had the opportunity to test out the rounds I loaded from 20gr to 22gr. None of them showed any pressure signs and I didn't get any bullets stuck in the barrel. The bad news is none of them locked the bolt back on the empty pmag. I loaded one round at a time to see if they would lock the bolt back. Next step is to load some at 22.5gr and maybe 23gr and see if I can get bolt lock back.
It was the first time firing this home built rifle and I ran some factory loads through it first to test the function of the rifle. The bolt locked back on the factory rounds.