6.8 SPC/224 Valkyrie BCG Phosphate Bolt Carrier GroupBolt carrier
group (full auto version) for your AR15, M16, or M4. Phosphate treated and
chrome lined inside carrier. This
M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome
lined and heat treated per USGI specifications. Gas key is secured to
carrier via USGI domestic mfg Grade 8 fasteners and properly staked per
Mil-Specs. These properly hardened parts insure a strong staking and
proper gas system functioning.