USM4 AR-15 Complete Bolt Carrier Group 5.56 NATO Mil-Spec Nickel Boron Finish

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USM4 is dedicated to bringing you the best parts and components for an exceptional value. This critical AR-15 component is produced by KE Arms for license by USM4 with an emphasis on robust quality and a dedication to the end user. This particular AR-15 complete Bolt Carrier group is Mil-spec compatible and features a Nickel Boron finish.

Specifications and Features:
USM4 1-56-04-509
AR-15 Complete Bolt Carrier Group
5.56mm NATO
Made in the USA
Nickel Boron