Bear Creek Complete upper with BGG & charging handle is ready to drop in on your favorite lower ! This upper is machined from 7075-T6 forgings that are hard coat anodized for wear and scratch resistance meeting MIL SPEC. These are great Complete uppers at an Affordable price .
Twist rate is 1 in 9. The barrels are chambered in the classic 5.56 Nato round.
The steel barrel assemblies are Parkerized to eliminate rusting. Bolts are machined from tool steel, hardened, and tempered to provide maximum wear characteristics and then Parkerized to eliminate rusting.
Bolt carriers machined from 8620 gun quality steel, heat treated and tempered to maximize strength and wear characteristics then Parkerized to eliminate rusting.
The barrels are made from 4140 cold rolled steel and are rated at a barrel life of approximately 150,000 rounds. They are very top end.