Geissele Automatics167529658
Geissele Automatics Ar-15 Super Duty Mod1 5.56X45 11.5'' Bbl Complete Upper Ddc$1,450.00
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Availability: In Stock
Current Stock: Out of stock
The Geissele Automatics AR-15 Super Duty Mod1 5.56x45 11.5" complete upper delivers serious reliability and accuracy in a combat-proven design. This is a complete, ready-to-run upper receiver built with precision cold hammer forge barrels, a Nanoweapon-coated bolt carrier group, and the SMR MK16 rail fielded by USASOC operators. Whether you're building a duty rifle, running competition, or just want a top-tier upper that works hard in harsh conditions, the Super Duty Mod1 combines materials science, proven design, and relentless quality control—no shortcuts, no guesses.
The 11.5" barrel is Chrome Lined with a 1-7 twist rate, designed and manufactured at Geissele's North Wales, PA facility using the highest-grade materials. Topped with the HUXWRX Flash Hider-QD muzzle device and backed by a Super Compact Gas Block, this upper is optimized for both accuracy and reliability across duty cycles. The included Reliability Enhanced Bolt Carrier Group features extended upper rails for superior feeding stability and a Nanoweapon-coated, staked and torqued gas key. The Stressproof Bolt—forged from Carpenter 158+ steel with optimized grain structure—is rated for 5 times the service life of mil-spec bolts.
Everything ships complete: upper receiver with cam pin cut-out, Nanoweapon-coated BCG, Stressproof Bolt with asymmetric cam pin, SMR MK16 rail with center-aligning tab to prevent rotation, Airborne Charging Handle, and HUXWRX muzzle device. This is a no-compromises upper for shooters who demand performance and durability in the field or on the range.
| Caliber | 5.56x45 NATO |
| Barrel Length | 11.5" |
| Barrel Type | Cold Hammer Forged, Chrome Lined, 1-7 Twist, Geissele Profile |
| Muzzle Device | HUXWRX Flash Hider-QD |
| Rail System | Super Modular Rail (SMR) MK16 |
| Gas Block | Geissele Super Compact Gas Block |
| Gas Tube | Carbine Length |
| Bolt Carrier Group | Nanoweapon Reliability Enhanced BCG with extended upper rails |
| Bolt | Geissele Stressproof Bolt (Carpenter 158+, forged, mag-particle inspected) |
| Cam Pin | H13 medical-grade steel, Nanoweapon coated, asymmetric design |
| Charging Handle | Airborne Charging Handle |
| Upper Receiver | Super Duty with cam pin cut-out |
| Color | Black |
This is a complete upper receiver. It arrives fully assembled and ready to install on any AR-15 lower receiver—barrel, bolt carrier group, charging handle, muzzle device, rail, and gas block are all included.
This upper is chambered in 5.56x45 NATO and features a 1-7 twist barrel, which stabilizes a wide range of 5.56mm projectile weights.
The Geissele Stressproof Bolt is forged (not machined) from Carpenter 158+ steel, a proprietary material developed with Carpenter Steel metallurgists for lower impurities, greater fatigue resistance, and an optimized grain structure. Geissele rates it for 5 times the service life of mil-spec bolts. Every bolt is high-pressure tested, mag-particle inspected, and Nanoweapon coated.
No. The SMR MK16 rail uses a center-aligning tab that interfaces with the upper receiver, eliminating any chance of rail rotation while providing the ergonomic design proven by USASOC operators.
SKU: 167527279 • Weight: 4.5oz
Availability: In Stock
Current Stock: Out of stock
The Geissele Automatics AR-15 Super Duty Mod1 5.56x45 11.5" complete upper delivers serious reliability and accuracy in a combat-proven design. This is a complete, ready-to-run upper receiver built with precision cold hammer forge barrels, a Nanoweapon-coated bolt carrier group, and the SMR MK16 rail fielded by USASOC operators. Whether you're building a duty rifle, running competition, or just want a top-tier upper that works hard in harsh conditions, the Super Duty Mod1 combines materials science, proven design, and relentless quality control—no shortcuts, no guesses.
The 11.5" barrel is Chrome Lined with a 1-7 twist rate, designed and manufactured at Geissele's North Wales, PA facility using the highest-grade materials. Topped with the HUXWRX Flash Hider-QD muzzle device and backed by a Super Compact Gas Block, this upper is optimized for both accuracy and reliability across duty cycles. The included Reliability Enhanced Bolt Carrier Group features extended upper rails for superior feeding stability and a Nanoweapon-coated, staked and torqued gas key. The Stressproof Bolt—forged from Carpenter 158+ steel with optimized grain structure—is rated for 5 times the service life of mil-spec bolts.
Everything ships complete: upper receiver with cam pin cut-out, Nanoweapon-coated BCG, Stressproof Bolt with asymmetric cam pin, SMR MK16 rail with center-aligning tab to prevent rotation, Airborne Charging Handle, and HUXWRX muzzle device. This is a no-compromises upper for shooters who demand performance and durability in the field or on the range.
| Caliber | 5.56x45 NATO |
| Barrel Length | 11.5" |
| Barrel Type | Cold Hammer Forged, Chrome Lined, 1-7 Twist, Geissele Profile |
| Muzzle Device | HUXWRX Flash Hider-QD |
| Rail System | Super Modular Rail (SMR) MK16 |
| Gas Block | Geissele Super Compact Gas Block |
| Gas Tube | Carbine Length |
| Bolt Carrier Group | Nanoweapon Reliability Enhanced BCG with extended upper rails |
| Bolt | Geissele Stressproof Bolt (Carpenter 158+, forged, mag-particle inspected) |
| Cam Pin | H13 medical-grade steel, Nanoweapon coated, asymmetric design |
| Charging Handle | Airborne Charging Handle |
| Upper Receiver | Super Duty with cam pin cut-out |
| Color | Black |
This is a complete upper receiver. It arrives fully assembled and ready to install on any AR-15 lower receiver—barrel, bolt carrier group, charging handle, muzzle device, rail, and gas block are all included.
This upper is chambered in 5.56x45 NATO and features a 1-7 twist barrel, which stabilizes a wide range of 5.56mm projectile weights.
The Geissele Stressproof Bolt is forged (not machined) from Carpenter 158+ steel, a proprietary material developed with Carpenter Steel metallurgists for lower impurities, greater fatigue resistance, and an optimized grain structure. Geissele rates it for 5 times the service life of mil-spec bolts. Every bolt is high-pressure tested, mag-particle inspected, and Nanoweapon coated.
No. The SMR MK16 rail uses a center-aligning tab that interfaces with the upper receiver, eliminating any chance of rail rotation while providing the ergonomic design proven by USASOC operators.
SKU: 167527279 • Weight: 4.5oz