The FailZero bolt carrier group features EXO nickel boron coating for ultra-slick operation, easy cleaning, and superior corrosion/wear resistance. It’s a complete BCG including carrier, bolt, properly staked gas key, firing pin, cam pin, and retaining pin. Drop-in compatible with mil-spec AR-15 uppers and interfaces with 5.56/.223 barrels and barrel extensions, gas blocks/tubes, and charging handles. Works with standard AR-15 lowers, hammers/fire-control groups, buffer tubes, buffers/springs, and magazines—delivering reliable feeding, locking, extraction, and cycling.
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