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This drop in ready, upper receiver assembly features a forged aluminum Mil-Sport AR-15 pattern upper receiver with a 16 inch barrel with 1:24 button cut rifling and black nitride finish chambered for 450 Bushmaster. Completed with a 15 inch aluminum free floated key-mod rail system over a carbine length low profile DGIS gas system, A2 style compensator and black nitride finished bolt carrier group. Fits to any AR-15 pattern lower receiver. from AIM Surplus (Product XATI15MS450BM)

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