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Aero precision upper and keymod handguard with a Ballistic Advantage 10.5" barrel in 5.56 NATO with 1/7 twist, QPQ finish. NiB bolt carrier group also from Aero. Seekins Precision BAR interface barrel nut. The whole thing has about 50 rounds through the tube. Provide your own charging handle and muzzle device and you're ready to go. $475.