I have a mutt M4 type carbine that I built. It has Stag upper & lower receivers, a Stag buttstock, a Double Star LPK, a Bushmaster bolt and carrier, an unknown charging handle, a Stag carry handle, and a Sabre 14.5" M4 type barrel with a permanently attached extended A2 type flash hider. Here's a picture:
It has been 100% reliable so far, handles well, and is more accurate than I am. I do have something interesting happening though. The spent cases only eject about a yard or less. They don't get flung out like happens with my other AR's. Many of the case heads are also left with a bright smear mark and a sharp burr.
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It almost seems like something is slipping and then catching. I reload, so I'm going to have to file these burrs off. This has happened with both Prvi 55gr FMJ and Remington 55gr FMJ. Is this a sign of some sort of problem? Is there something that I need to fix?



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