• The 300 Blackout allows for shooting of various grain weights and performs exceptionally with subsonic ammo and suppressors
  • This is made from 7075 aircraft-grade aluminum billets with a parkerized finish and is compatible with any mil-spec AR-15 lower

BCA .300 Blackout Billet Upper Receiver - 15” Parkerized Heavy Barrel, 1:8 Twist, Pistol Length Gas System, 15” MLOK Rail

$429.99

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We offer standard, 3 day express, 2 day express, and overnight express shipping options for your convenience. If you place your order Monday - Friday by 2:00 PM EST using one of our express shipping options, your order will be processed and shipped the same day it is placed!

Applies to delivery within the 48 contiguous states only.
Shopper Award

  • The 300 Blackout allows for shooting of various grain weights and performs exceptionally with subsonic ammo and suppressors
  • This is made from 7075 aircraft-grade aluminum billets with a parkerized finish and is compatible with any mil-spec AR-15 lower
  • The rifle length upper receiver has a 16” heavy barrel and features a 1:8 twist rate, with a pistol length gas system
  • It includes a 15 1/4” MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle


Considered by some to be the American answer to 7.62x39, the 300 Blackout has been modified to use the same magazines and bolt as the common 5.56 NATO. The 300 Blackout allows for shooting of various grain weights and performs exceptionally with subsonic ammo and suppressors. The BCA .300 Blackout Billet Upper Receiver is made from 7075 aircraft-grade aluminum billets with a parkerized finish and is compatible with any mil-spec AR-15 lower. The rifle length upper has a 16” heavy barrel and features a 1:8 twist rate, with a pistol length gas system. It includes a 15 1/4” MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a rear charging handle. Bear Creek Arsenal manufactures all complete upper assemblies, barrels, bolt carrier groups, and components in-house in Sanford, N.C.

52 AR4752


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