The Geissele Super Duty MOD1 300 Blackout Complete Upper is an 8-inch AR upper assembly chambered for 300 Blackout. It has a cold hammer-forged, chrome-lined 1:7 twist barrel and a Phased Array Tri-Port gas system with a custom pistol-length gas configuration. The package includes a Nanoweapon Reliability Enhanced BCG with a Stressproof bolt, an Airborne Charging Handle, a 7″ Super Modular Rail MK16 with center tab, a braided buffer spring with H1 buffer, and a HUXWRX Flash Hider-QD threaded 5/8×24. The assembly measures 17 1/8″ overall, weighs approximately 3.3 lb, and is manufactured by Geissele Automatics in North Wales, Pennsylvania, USA.
Features:
- Complete 8″ 300 Blackout upper assembly
- Cold hammer-forged, chrome-lined 1:7 twist barrel
- Geissele Phased Array Tri-Port gas system (pistol-length gas)
- Nanoweapon Reliability Enhanced BCG with Stressproof bolt
- Airborne Charging Handle
- 7″ Super Modular Rail MK16 with center tab
- Antistrike Super Compact gas block
- Braided buffer spring with H1 buffer combo
- HUXWRX Flash Hider-QD, 5/8×24 muzzle thread
- Overall length 17 1/8″ and approximate weight 3.3 lb


