Geissele Super Duty MOD1 5.56 NATO 10.3" 1:7" CHF Chrome Lined Bbl DDC Complete Upper Receiver Group 08-543S

Geissele Super Duty MOD1 5.56 NATO 10.3" 1:7" CHF Chrome Lined Bbl DDC Complete Upper Receiver Group (SKU: 08-543S) offers a compact yet highly durable platform designed for close-quarters and tactical applications. It features a 10.3-inch Cold Hammer Forged chrome-lined barrel with a 1:7 twist rate, delivering reliable accuracy and extended barrel life under harsh conditions. The upper includes a mid-length gas system paired with Geissele’s Super Compact Gas Block to ensure consistent cycling and reduced recoil. Finished in Desert Dirt Color (DDC), this complete upper group combines rugged construction with sleek tactical aesthetics.

This upper receiver group comes fully assembled with Geissele’s REBCG (Reliability Enhanced Bolt Carrier Group), featuring a precision-machined cam path and a properly staked gas key for maximum reliability. It is equipped with the Airborne Charging Handle, designed for smooth ambidextrous operation and reduced snag potential. The 9.3-inch MK16 M-LOK handguard offers ample mounting options for accessories while maintaining a lightweight profile. Constructed from 7075-T6 aluminum with a Type 3 hardcoat anodized finish, this upper delivers exceptional strength and corrosion resistance for demanding environments.

• Caliber: 5.56 NATO
• Barrel Length: 10.3 inches
• Barrel Twist Rate: 1:7"
• Barrel Type: Cold Hammer Forged, Chrome Lined
• Gas System: Mid-Length with Super Compact Gas Block
• Rail: 9.3" MK16 M-LOK, Desert Dirt Color (DDC)
• Includes REBCG (Reliability Enhanced Bolt Carrier Group)
• Includes Airborne Charging Handle
• Upper Receiver: 7075-T6 Aluminum, Type 3 Hardcoat Anodized