Geissele Super Duty MOD1 5.56 NATO 13.9" 1:7" CHF Chrome Lined Pinned & Welded Bbl DDC Complete Upper Receiver Group 08-546S

The Geissele Super Duty MOD1 5.56 NATO 13.9" Complete Upper Receiver Group 08-546S combines a 13.9-inch cold hammer-forged, chrome-lined barrel with a pinned and welded muzzle device, mid-length gas system, Super Modular Rail, Reliability Enhanced Bolt Carrier Group, and Airborne Charging Handle. Finished in Desert Dirt Color (DDC), this complete assembly brings together a range of Geissele components in a cohesive upper receiver configuration.

The barrel features a 1:7 twist rate and cold hammer-forged construction with a chrome-lined bore. The chrome lining provides additional corrosion resistance and contributes to the barrel's durable construction. Its 13.9-inch length is paired with a mid-length gas system, creating the specified configuration for this Super Duty assembly.

At the front of the upper, the muzzle device is pinned and welded to the barrel. This permanent attachment is part of the factory configuration and complements the 13.9-inch barrel. The upper also includes a Geissele pinned gas block as part of the gas system assembly.

The 13.5-inch Super Modular Rail (SMR) provides M-LOK mounting positions along the handguard for compatible accessories. Its design integrates with the upper receiver while maintaining a streamlined profile. The assembly also includes Geissele's Reliability Enhanced Bolt Carrier Group (REBCG) and Airborne Charging Handle.

The upper receiver is manufactured from 7075-T6 aluminum and features a Type 3 hardcoat anodized finish. Together with the DDC finish on the barrel and rail components, the configuration has a consistent Super Duty appearance.

For those looking for a Geissele Super Duty 13.9 upper, this complete assembly brings together a CHF chrome-lined barrel, mid-length gas system, pinned and welded muzzle device, modular handguard, REBCG, and Airborne Charging Handle.

Features:

• 5.56 NATO chambering
• 13.9-inch CHF barrel
• 1:7 twist rate
• Chrome-lined bore
• Pinned and welded muzzle device
• Mid-length gas system
• 13.5-inch Super Modular Rail
• Reliability Enhanced BCG