• The low recoil makes it a pleasure to shoot whether you are just backyard plinking, competitive shooting, or hunting small game
  • The assembly is made from 7075 aircraft-grade aluminum billets and has a 7 1/2” M4 contour barrel with a parkerized finish

BCA 5.56 NATO Billet Upper Receiver - 7 1/2” Parkerized M4 Barrel, 1:7 Twist, Pistol Length Gas System, 7" MLOK Rail

$399.99

Discount Price:

$331.99

You Save 18%!

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Fast and Accurate Order Processing

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 low recoil makes it a pleasure to shoot whether you are just backyard plinking, competitive shooting, or hunting small game
  • The assembly is made from 7075 aircraft-grade aluminum billets and has a 7 1/2” M4 contour barrel with a parkerized finish
  • It features a 1:7 twist rate, with a pistol length gas system and it includes a 7 5/16” MLOK rail, and an M4 flat-top billet upper receiver
  • It also includes a BCA bolt carrier group, a flash hider, and a rear charging handle, all backed by BCA’s lifetime warranty


The NATO 5.56 is the perfect all-around caliber, and the low recoil makes it a pleasure to shoot whether you are just backyard plinking, competitive shooting, or hunting small game. Bear Creek Arsenal AR-15 billet upper receivers are made from 7075 aircraft-grade aluminum billets. This 5.56 NATO Billet Upper Receiver is compatible with any mil-spec AR-15 lower and it has a 7 1/2” M4 contour barrel with a parkerized finish. It features a 1:7 twist rate, with a pistol length gas system and it includes a 7 5/16” 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 of its complete upper assemblies, barrels, bolt carrier groups, and components in-house in Sanford, N.C.

52 AR4721


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BCA 5.56 NATO Billet Upper Receiver - 7 1/2” Parkerized M4 Barrel, 1:7 Twist, Pistol Length Gas System, 7" MLOK Rail
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BCA 5.56 NATO Billet Upper Receiver - 7 1/2” Parkerized M4 Barrel, 1:7 Twist, Pistol Length Gas System, 7" MLOK Rail
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