Q Boombox, Semi-automatic, Short Barreled Rifle, 8.6 Blackout, 12 Threaded Barrel, Clear Anodized Finish, Flat Dark Earth, Ambidextrous Safety, Reptilia CQG-NB Grip, 11 Q-Sert Handguard, 2 Position Stock, 1 Magazine, 20 Rounds, Product Finishes, Shade Variations, and Other Imperfections are Normal Due to the Manufacturing Process BOOMBOX-86-12IN-SBR The Boombox is a 12-inch direct impingement SBR chambered in 8.6 Blackout. It features a 1:3 twist barrel, a Cherry Bomb muzzle device, no forward assist, and an adjustable gas block.