Geissele Super Duty MOD1 Complete Upper Receiver Group 8" .300 Blackout - Black

Advanced .300 Blackout Platform with Phased Array Gas System Technology

The Geissele Super Duty MOD1 .300 Blackout represents the current evolution of Geissele's proven platform, incorporating continuous design development to deliver superior ergonomics and modularity while maintaining the established balance of performance and reliability. This complete upper receiver group features cutting-edge firearm technology available exclusively from Geissele Automatics, specifically engineered to optimize .300 Blackout performance across all ammunition types.

Key Features

• Patented Phased Array Gas System - Utilizes multiple gas ports to precisely balance gassing, eliminating the need for adjustable gas systems
• Cold Hammer Forged Chrome-Lined Barrel - Precision machined from Chrome Moly Vanadium steel in North Wales, PA
• Included Buffer System - Ships with Geissele braided buffer spring and H1 buffer for optimal cycling
• Nanoweapon Coating - Advanced surface treatment providing diamond-level hardness and superior corrosion resistance
• Reliability Enhanced BCG - Features forged Stressproof Bolt with asymmetric cam pin design
• SMR MK16 Rail System - 7" rail with center tab alignment for enhanced modularity
• HUXWRX Flash Hider - QD-compatible 762 flash hider optimized for suppressor use

The Super Duty MOD1 .300 Blackout incorporates Geissele's proprietary Phased Array gas system technology, which represents a significant advancement in gas system design. Rather than relying on a single gas port, this system utilizes multiple carefully engineered ports to achieve precise gas regulation. This innovation ensures consistent cycling performance whether shooting suppressed or unsuppressed, with both supersonic and subsonic ammunition loads.

The 8" cold hammer forged barrel features chrome lining throughout the bore and chamber, providing enhanced durability and corrosion resistance. The 1-8 twist rate is optimized for stabilizing the full range of .300 Blackout projectile weights commonly available. The custom pistol-length gas system works in conjunction with the Phased Array technology to deliver smooth, reliable operation.

The Reliability Enhanced Bolt Carrier Group represents years of development and refinement. The carrier is machined from mil-spec 8620 steel and features extended upper rails for enhanced stability and feeding reliability. The Stressproof Bolt is manufactured from Carpenter 158+ steel, developed in collaboration with Carpenter Steel metallurgists to create material with reduced impurities and enhanced fatigue resistance. Each bolt undergoes rigorous inspection, high-pressure testing, and magnetic particle inspection before receiving the Nanoweapon coating.

Geissele's Nanoweapon coating technology, developed from Picatinny DSL, provides surface hardness equivalent to synthetic diamond. This coating rejects carbon buildup, simplifies cleaning, and allows the firearm to operate with reduced lubrication while maintaining superior corrosion and wear resistance.

The 7" SMR MK16 rail system incorporates the center tab design that mates precisely with the upper receiver, eliminating any possibility of rail rotation while providing a robust mounting platform for accessories. The rail features M-LOK attachment points throughout its length for versatile accessory mounting options.