Geissele Automatics Super Duty MOD1 5.56 NATO Complete AR-15 Upper Receiver - 13.9" Pinned - DDC - 08-546S

Built for serious performance, the Geissele Super Duty MOD1 Complete Upper brings next-level reliability and precision to the 5.56 platform. At its core is a 13.9″ Cold Hammer Forged, chrome-lined barrel paired with Geissele’s Nanoweapon-coated Reliability Enhanced Bolt Carrier Group. Both the barrel and BCG are high-pressure tested and magnetic particle inspected for unmatched strength and accuracy.

The MOD1 Complete Upper offers a balanced mid-length gas system, featuring a Super Compact Gas Block and optimized .079 gas port, ensuring smooth cycling with reduced recoil, even under harsh conditions. The included HUXWRX Flash Hider-QD muzzle device, pinned and welded to the barrel, is ready for use with the HUXWRX FLOW series suppressors.

Features:

• 5.56 NATO caliber
• 13.9″ Cold Hammer Forged, chrome-lined barrel (pinned and welded)
• Mid-length gas system with Super Compact Gas Block (.079 port size)
• 12.9″ SMR MK16 handguard with center tab and QD sling mounts
• Nanoweapon-coated Reliability Enhanced BCG
• Geissele Stressproof bolt with asymmetric cam pin
• Airborne ambidextrous charging handle
• Nanoweapon-coated HUXWRX Flash Hider-QD muzzle device (1/2×28 thread)
• Overall length: 23.25″
• Weight: 4 lbs. 3 oz.
• Color: DDC (Desert Dirt Color)

A 12.9″ MK16 rail with Geissele’s center-tab design and integrated QD sling mounts gives you a rugged, modular mounting platform. The low-profile Airborne Charging Handle offers ambidextrous operation without snagging on gear. Finished in Geissele’s durable DDC color, the Super Duty MOD1 blends cutting-edge engineering with real-world dependability.

Note: Geissele’s Desert Dirt Color (DDC) finish refers to a variety of shades of desert terrain designed to better break up a rifle’s outline. These colors can vary drastically even between products from the same batch and ARE NOT intended to color match. Per Geissele Automatics, the only way to receive a uniform color across all parts and accessories is to have them painted with a different finish such as DuraCoat or Cerakote.