The Geissele Automatics Super Duty MOD1 Complete Upper is a factory-built AR-15 upper chambered in .223 REM/5.56 NATO with a 14.5″ pinned barrel (16″ overall length). It pairs a chrome-lined, cold hammer forged 1:7 twist barrel with a HUXWRX Flash Hider-QD and a carbine-length gas system with a Super Compact Gas Block for consistent operation. The assembly includes a 13.5″ Super Modular Rail MK16, a Nanoweapon-coated Reliability Enhanced Bolt Carrier Group, and a forged Stressproof bolt from Carpenter 158+ for enhanced longevity.
Key Specifications
- Chambered in .223 REM/5.56 NATO.
- Barrel length is 14.5″ pinned (16″ OAL).
- Barrel is cold hammer forged, chrome-lined, 1:7 twist.
- Muzzle device is a HUXWRX Flash Hider-QD.
- Gas system uses a carbine-length gas tube with Super Compact Gas Block.
- Rail is a 13.5″ Super Modular Rail MK16.
- Includes a Nanoweapon-coated Reliability Enhanced BCG.
- Bolt material is Carpenter 158+ Stressproof (forged).
- Finish and color are specified as black.
Built to integrate into AR-15 platforms, the Super Duty MOD1 Complete Upper combines field-proven components and robust manufacturing to deliver a durable, accurate upper assembly. Its specification set—cold hammer forged chrome-lined barrel, secure modular rail, and reinforced bolt system—makes it a practical choice for informed owners seeking reliable, high-quality performance in precision shooting and general-purpose configurations.
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