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So I recently built an AR pistol, it has a 10.5" barrel with a pistol length gas system. I loaded it up with brand new American Eagle 55 gr and the first shot we fired through it ended with it tearing the rim off the case and leaving it in the chamber. I cleared that and fired a few more rounds and it worked but seems to be tearing the rims up, not enough to leave them in the chamber but enough to make me concerned about its reliability (not to mention I don't want to beat the poop out of my brass, I just got into reloading and would like to get as much life out of my brass as I can).
Anyways I was wondering if any of you all have had similar experiences and if there is anything I can do to mitigate this (beyond getting a longer barrel/gas system). I'm assuming its having such a rough time extracting the cases because its doing so while the chamber pressure is still high. Will a heavier buffer/buffer spring help or do I need to get a adjustable gas block ? Is this something that will just need a "break in period" ? The barrel is new but the other parts (BCG/Buffer/Buffer Spring) are all old stuff that works just fine in a different upper with a 16" barrel.
Any suggestions would be appreciated!
Anyways I was wondering if any of you all have had similar experiences and if there is anything I can do to mitigate this (beyond getting a longer barrel/gas system). I'm assuming its having such a rough time extracting the cases because its doing so while the chamber pressure is still high. Will a heavier buffer/buffer spring help or do I need to get a adjustable gas block ? Is this something that will just need a "break in period" ? The barrel is new but the other parts (BCG/Buffer/Buffer Spring) are all old stuff that works just fine in a different upper with a 16" barrel.
Any suggestions would be appreciated!