Hi, I am new to the 300blackout, and although I have several AR platforms in 5.56, I am building my first one. I chose to build an AR pistol in 300blk, and I'm using the following components: (BTW, I will be running this Unsuppressed)
Mega Arms matched upper/lower (billet)
Noveske 10.2” (pistol length gas tube)
https://www.rainierarms.com/?page=shop/detail&product_id=2399
Battle Comp BABC muzzle break
https://www.rainierarms.com/?page=shop/detail&product_id=2211
BCM M16 (auto) BCG
BCM Bolt Carrier Group MPI Auto M16
Phase5 Tactical carbine-length pistol buffer tube
Phase 5 // AR-15 Pistol Buffer Tube
I would like to be able to run both sub and supersonic, but I realize that may be a stretch! When I was researching the barrel, Noveske recommended using an H buffer, BUT, they didn’t even know what BCG or muzzle break I would be using (I imagine using the auto BCG adds a little weight and would influence the choice of buffer?)
My question is related to the above topic: I have researched this to death, and came out with the conclusion that the Noveske 10.2" barrel SHOULD do ok with supersonic ammo/unsuppressed. My confusion is with what buffer to use. Based on Clint's (heavybuffers.com) recommendations, I ordered a HSS 6.5oz buffer and Wolffe spring. With the Noveske's .075 gas hole, am I running on the edge of being under-gassed? And if so, would running a heavier buffer such as the HSS make matters even worse?
My plan was to test it with the HSS first, and see if I have problems. If I do, swapping a standard carbine buffer from my BM or Colt, and seeing if that helps. That should give me the "range" of weights between "go" and "no-go"?
As stated before, I would PREFER to have the option of running both subs and supers, but I know this may not be feasible.
Any suggestions/tips/advice?
thank you