Geissele Super Duty MOD1 .300 BLK 8" 1:8" CHF Chrome Lined Bbl DDC Complete Upper Receiver Group is purpose-built for suppressed short-barreled rifle setups and optimized for the ballistic performance of the .300 Blackout cartridge. Featuring an 8-inch Cold Hammer Forged, chrome-lined barrel with a 1:8 twist, this upper provides excellent durability and accuracy across both subsonic and supersonic loads. The short barrel and carbine-length gas system ensure reliable cycling, even in suppressed configurations. This upper includes the Geissele Super Modular Rail MK16 in a 9.3-inch length, offering a sturdy M-LOK platform for attaching lights, grips, and other accessories. It ships fully assembled with a Geissele Airborne Charging Handle and Reliability Enhanced Bolt Carrier Group, making it ready to drop onto your registered SBR or pistol lower. Finished in Desert Dirt Color (DDC), this upper combines rugged performance with professional aesthetics for duty, defense, or suppressed applications. Caliber: .300 Blackout Barrel Length: 8 inches Twist Rate: 1:8" Barrel Type: Cold Hammer Forged, Chrome Lined Gas System: Carbine-Length Handguard: 9.3" MK16 Super Modular Rail (M-LOK) Finish: Desert Dirt Color (DDC) Includes Reliability Enhanced Bolt Carrier Group Includes Airborne Charging Handle Optimized for suppressed use Geissele Automatics Geissele Super Duty MOD1 .300 BLK 8" 1:8" CHF Chrome Lined Bbl DDC Complete Upper Receiver Group 08-553S