Geissele Automatics Super Duty MOD 1 Heavy Barrel 5.56 NATO Complete Upper Receiver - 14.5" P&W

The Geissele Automatics Super Duty MOD 1 Complete Upper Receiver features a 14.5-inch pinned and welded Super Heavy Barrel chambered in 5.56 NATO. Designed to accommodate sustained use, the upper is built around a .812 gas journal and Geissele’s reinforced HBAR straight gas system for superior heat dissipation and reliable cycling. A 13.5-inch MK16 Super Modular Rail with center tab provides a stable platform with stainless QD inserts, while the Nanoweapon-coated HUXWRX Flash Hider-QD 6 allows for seamless suppressor integration. Weighing approximately 5.2 lbs, this upper includes Geissele’s Airborne Charging Handle, Stressproof Bolt, and Reliability Enhanced Bolt Carrier Group.

Features:

• Chambered in 5.56 NATO
• 14.5” Super Heavy Barrel, CHF, chrome-lined with 1:7 twist
• Mid-length gas system with .076" gas port
• Reinforced .812 gas block and straight gas tube
• Super Duty upper receiver with cam pin cut-out
• 13.5" MK16 M-LOK rail with stainless steel QD inserts
• Nanoweapon Reliability Enhanced Bolt Carrier Group
• Geissele Stressproof Bolt with asymmetric cam pin
• Nanoweapon-coated HUXWRX Flash Hider-QD 6 (pin and welded)
• Airborne Charging Handle (ACH)
• Weighs approximately 5.2 lbs