Premium quality Nickel Boron 5.56 Bolt Carrier Groups

These are the best you'll find on the market and fully polished prior to nickel boron coating.

Features:

• MPI Bolt (magnetic particle inspected)

• Carpenter 158 steel bolt (nickel boron coated)

• Shot peened bolt

• Grade 8 hardened fasteners

• 8620 heat treated carrier, polished w/nickel boron coating

• Key staked per Mil-Spec

• UTC Nickel Boron Coated

• Made in USA

http://www.uctcoatings.com/capabilities/coatings/