joker4cGeissele Super Duty MOD1 .300 BLK 8" 1:7" CHF Chrome Lined Bbl Black Complete Upper Receiver Group 08-553B. Brand new, never used. Comes with original box. HUXWRX muzzle device swapped for Lantac Dragon DA Xeno Brake. Ejection port cover and forward assist swapped for Strike Industries. All other parts original G$. Specs: Caliber: .300 Blackout Barrel Length: 8" Barrel Twist Rate: 1:7" Barrel Construction: Cold Hammer Forged, Chrome Lined Gas Block: Geissele Pinned Low-Profile Muzzle Device: HUXWRX Flash Hider-QD 762 Handguard: 7" MK16 Super Modular Rail, M-LOK Charging Handle: Geissele Airborne Charging Handle Finish: Black Part Number: 08-553B
