The Rosco 10.5 Inch Bloodline – YHM 5140 SLR Rail upper features a Rosco 10.5 Inch Bloodline Series Govt Profile Barrel, chambered in 5.56, 1:7 twist, carbine length gas system, .750 journal and a 1/2-28 threaded muzzle. Machined from 4150 Chrome Moly Vanadium steel with a Nitride Finish. Built on a Milspec forged flattop receiver with a Yankee Hill Machine 5140 SLR Rail and an A2 flash hider.

These are assembled and test fired by PK Firearms.

Complete with M-16 bolt carrier group and forged charging handle.