Geissele Automatics Super Duty MOD1 5.56 NATO No Magazine 16" Black Heavy Threaded Barrel, Black Receiver w/Picatinny Rail, B5 Enhanced SOPMOD Black Polymer Stock, A17 Grip The Super Duty MOD1 Heavy Barrel (HBAR), takes the Super Duty platform to the next level, with a heavy profile barrel that can handle sustained rates of fire while maintaining accuracy and reliability. Featuring an the in-house produced Cold Hammer Forged, chrome-lined Heavy barrel; Nanoweapon coated Reliability Enhanced Bolt Carrier Group; gas system, including the bomb-proofed Super Gas Block, fine-tuned gas port sizing and Super 42 braided buffer spring; Nanoweapon coated HUXWRX Flash Hider-QD muzzle device; SSA-E X two-stage trigger Lightning Bow shape; ambidextrous configurable safety; Airborne Charging Handle; checkered magazine release and Maritime bolt catch; MK16 rail; B5 SOPMOD stock; A17 grip and Geissele Quick Disconnect (QD) Sling Mount Endplate and stainless steel QD inserts on the MK16 rail.