Convenient kits with all the parts needed to put together a reliable, smooth-cycling AR-15 bolt/carrier assembly. Carriers have forward assist notches and fully staked gas keys. Each kit also includes a fully assembled bolt, plus cam pin, firing pin, and firing pin retaining pin. Bushmaster features a precision machined, ordnance-grade steel, chrome-lined carrier and a bolt made from high-strength Carpenter 158 steel alloy for superb resistance to heat and impact. Magnetic particle inspected to ensure no microscopic cracks or flaws. Smith Enterprise includes a hard-chromed bolt and carrier for reduced friction coefficient and exceptional resistance to surface wear; magnetic particle inspected. JP Enterprises features a hand-polished stainless steel carrier that has a larger bearing surface than standard carriers for precise alignment in the upper receiver for less wear. High-lubricity black QPQ finish promotes smooth cycling. Non-plated carrier bore is roller burnished for low-drag movement of bolt.
SPECS:
Bushmaster – Carrier: 8620 steel, Parkerized, dark gray matte finish. Bolt: Carpenter 158 steel alloy, heat-treated and hardened. Smith Enterprise – 8620 steel, heat-treat, hardened, and hard-chrome plated, silver finish. JP Enterprises – 416 stainless steel, polished, black QPQ finish.
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