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CFenton90

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    Caro, MIchigan
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    Michigan
  1. Carbine length gas system. Not sure on the buffer weight. The buffer system is still factory Smith&Wesson M&P 15. The ammo is Hornaday American Gunner 125gr. No subsonic, no suppressor.
  2. Hey guys, new to the site so I apologize if this is a repeat. I put together a .300 AAC Blackout upper and just recently put some rounds through it. Everything works fine, except the bolt carrier locking back when the mag is empty. I'm using the same bolt carrier assembly as I do for the 5.56 upper, and same mags, same everything on the lower. The Pmags don't have any problem when shooting 5.56, so I'm not sure what to investigate next. Buffer spring? Maybe not letting the BCA come back far enough to lock? Not a big problem, just curious to hear what anybody thinks.
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