Geissele Super Duty MOD1 5.56 NATO 12.5" 1:7" CHF Chrome Lined Bbl DDC Complete Upper Receiver Group 08-545S is engineered for professional-grade performance with rugged components and battle-tested reliability. The 12.5-inch barrel is cold hammer forged and chrome lined, built to handle high round counts and extreme conditions without compromising accuracy. A 1:7 twist rate provides excellent stability for a wide range of 5.56 NATO bullet types, making this upper a versatile choice for any mission profile.

The included MK16 10.5" Super Modular Rail in DDC finish offers ample M-LOK space for lights, grips, and lasers, with rock-solid mounting integrity. This upper also features a Geissele Airborne Charging Handle, low-profile pinned gas block, and SureFire 3-Prong Flash Hider for suppressor-ready versatility. Finished in Geissele's signature Desert Dirt Color, this complete upper is ready for your next duty build or high-performance SBR setup.

• Caliber: 5.56 NATO
• Barrel Length: 12.5"
• Barrel Twist Rate: 1:7
• Barrel Construction: Cold Hammer Forged, Chrome Lined
• Handguard: 10.5" MK16 Super Modular Rail, M-LOK
• Gas Block: Geissele Pinned Low-Profile
• Muzzle Device: SureFire 3-Prong Flash Hider
• Charging Handle: Geissele Airborne Charging Handle
• Finish: Desert Dirt Color (DDC)
• Part Number: 08-545S