Geissele Automatics Super Duty MOD1 300 Blackout AR-15 SBR - 8" - No Mag

The Geissele Super Duty MOD1 300BLK brings the latest Super Duty platform technology to .300 Blackout, using Geissele's patented Phased Array gas system to precisely balance gassing without needing an adjustable gas block. Built with a cold hammer-forged, chrome-lined barrel machined in-house, this AR-15 rifle delivers smooth, reliable cycling whether running supersonic or subsonic ammunition, suppressed or unsuppressed.

Features:

• Cold hammer-forged, chrome-lined barrel, Chrome Moly Vanadium steel
• Chambered in .300 AAC Blackout
• Patented Phased Array gas system with Geissele Tri-Port System
• Geissele braided buffer spring
• Nanoweapon-coated Reliability Enhanced BCG, forged Carpenter 158+ Stressproof Bolt
• SSA-E X two-stage trigger, Lightning Bow shape
• Airborne charging handle
• Geissele Super Modular Rail MK16 with center tab
• Ultra Duty lower parts kit
• Super Configurable safety selector
• Geissele A17 grip
• Geissele QD sling mount endplate
• Black finish
• Includes one magazine

The Phased Array gas system's Tri-Port design precisely balances gassing across the barrel's full pressure curve, eliminating the need for a manually adjustable gas block while still running reliably across supersonic and subsonic .300 Blackout loads, suppressed or unsuppressed. The Nanoweapon-coated Reliability Enhanced BCG pairs with a forged Carpenter 158+ Stressproof Bolt for extended service life under high round counts, and the SSA-E X two-stage trigger delivers a refined, consistent pull well beyond a standard mil-spec trigger. The rifle is finished in black.

Founded in 2004 by Bill Geissele in Pennsylvania, Geissele Automatics built its reputation on precision AR-15 triggers before expanding into rail systems, gas systems, and complete rifles. The Super Duty MOD1 reflects that same engineering rigor across a full platform rather than just its components.