Bushmaster AR-15 Varminter A3 Upper Receiver Assembly

Features a 24 inch fluted extra heavy barrel in 5.56mm/.223 Remington caliber with 11 degree competition crown; heavyweight 1-inch diameter under the handguard; custom match hybrid chamber with a tighter SAAMI Spec headspace from the shoulder of the chamber to the bolt face, and longer chamber throat. Chrome-moly steel barrel with black matte finish. 1:9 inch rifle twist. Vented forend with bipod/sling stud installed, free-loats the barrel from the barrel nut forward. Come complete with bolt, bolt carrier and charing handle. A3 flat top. No sights.