Assembled from All New Components, Now with Handguard and Muzzle Device The BRN-4A(R) Upper Receiver is now available as a Complete Upper, with Handguard, Muzzle Device, Barrel and Gas System installed. Simply attach to your AR-15 lower receiver and you're ready to hit the range! These complete uppers have the option of shipping with a shorter barrel configuration, with a 9 inch Midwest Industries handguard, or on the longer length barrel models, a 13.5 inch Midwest Industries handguard. The handguards feature plentiful MLOK attachment point, as well as a full length picatinny rail. Built from the ground up, the core of the BRN-4A(R) Upper Receiver is an all new Bol Mfg: Brownells