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AR-15 Complete 16 & Quot; 5.56 Mm M4 Upper Receiver
by Bear Creek Arsenal, LLC
In stock at Brownells - Use Coupon M6S for free shipping over $49 til 12/31/17
on 12-13-2017.
Product Description
The Bear Creek Arsenal complete 16” 300BLK upper receiver features a 1:9 twist with a carbine length gas system.
  • ½-28 threads
  • 4150 chrome moly vanadium
  • BCA does not recommend using steel cased ammunition with this receiver