FN15/AR 20" Rifle Upper Receiver Assembly
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Complete upper assembly includes, bolt carrier group and charging handle. Barrel cold hammer forged. Proprietary CrMoV barrel steel. Hard-chrome lines to mil-std 171. M4 feed ramps. High pressure tested. Magnetic particle inspected. Manganese phosphate finish. Chambered in 5.56x45mm. 1:7 RH twist. Bolt carrier group/ bolt. M16 auto bold carrier assembly. Carpenter 158 bolt ( magnetic particle inspected). Staked gas key.
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