The Geissele Automatics Super Duty (SD) 5.56 is an elite, tier-one AR-15 platform engineered from the ground up for absolute mechanical reliability, flat-shooting control, and hard-use tactical applications. Built to exceed stringent combat and law enforcement duty requirements, the Super Duty stands out as a true masterclass in weapon technology. Every critical component is manufactured or optimized in-house, featuring a precision-tuned gas loop and a Reliability Enhanced Bolt Carrier Group (REBCG) coated in advanced nanoweapon technology for unparalleled lubricity and effortless cleaning. Pairing a proprietary heat-dispersing tapered profile barrel with the ultra-rigid, anti-rotation MK16 free-float handguard, the Super Duty delivers flat-shooting authority and duty-grade accuracy right out of the box. - VERY GOOD CONDITION - NO BOX - ONE 30-ROUND MAGAZINE Caliber: 5.56 NATO (safely fires both 5.56x45mm NATO and .223 Remington duty ammunition). Operating System: Direct Impingement (DI) powered by an optimized, soft-cycling Geissele-length gas system. Trigger System: SSA-E X(R) two-stage trigger featuring the Lightning Bow(R) profile for a crisp, match-grade duty break. Bolt Carrier Group: Reliability Enhanced BCG featuring a Geissele Forged Stressproof Bolt(R) crafted from advanced Carpenter 158+ steel. Barrel Layout: Cold Hammer Forged (CHF), chrome-lined barrel with a proprietary Geissele Tapered Profile optimized for superior heat dispersion. Barrel Twist Rate: 1:7" right-hand twist rate precisely engineered to stabilize heavy-duty tactical projectiles. Handguard: 15" MK16 Super Modular Rail keyed directly into the upper receiver using an anti-rotation indexing center tab. Charging Handle: Airborne Charging Handle (ACH(R)) equipped with an integrated gas-buster lip to deflect suppressed blowback. Gas Block: Bombproof, pinned Super Compact Gas Block machined to guarantee zero movement under structural stress. Muzzle Device: HUXWRX Flash Hider-QD 556 threaded at 1/2x28 TPI for clean signature reduction and suppressor mounting. Buffer System: Super 42(R) braided wire buffer spring paired with an H2 buffer assembly to flatten recoil impulses.