FAIL ZERO EXO AR15 / M4 Bolt Carrier Group
This video from Fun Gun Reviews showcases the Fail Zero EXO AR15/M4 Bolt Carrier Group, highlighting its Nickel-Boron coating. The reviewer, Sootch00, emphasizes its reliability for AR15 rifles, suggesting it's a top-tier upgrade for those who want to minimize failures. The product is available through American Built Arms (ABArms).










