Geissele Automatics Super Duty MOD1 HBAR Complete AR-15 Upper Receiver - 5.56 - 16"

The Geissele Automatics Super Duty MOD1 HBAR Complete AR-15 Upper Receiver in 5.56 pairs a heavier HBAR-profile 16" barrel with a reinforced .812 gas block and thicker straight gas tube, built to manage high volumes of fire while holding accuracy.

Features:

• 16" cold hammer forged, chrome-lined HBAR barrel, 1:7 twist
• .812" gas journal with custom reinforced .812" gas block
• Thicker, straight gas tube for heat reduction
• Nanoweapon-coated Reliability Enhanced bolt carrier group
• Forged Stressproof bolt, HPT and MPI tested
• Nanocoated HUXWRX Flash Hider-QD, compatible with HUXWRX FLOW suppressors
• MK16 free-float M-LOK rail with stainless steel QD sling inserts
• Geissele Airborne charging handle

The heavier HBAR profile and reinforced .812" gas block are built specifically for sustained, high-volume fire, where a standard-profile barrel and gas block would run hotter and lose accuracy faster. The thicker straight gas tube adds further heat management, and the MK16 rail's M-LOK slots and integral QD sockets give you the same accessory flexibility as Geissele's standard Super Duty line.

Geissele Automatics built its reputation on the Hi-Speed National Match trigger, later adopted by U.S. Special Operations for a select-fire variant, and now applies that same quality control to complete upper receivers for warfighters, competitors, and civilian shooters alike.