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Description
Product Overview
Built without compromise, the Geissele Automatics Super Duty MOD1 12.5" Complete Upper Receiver delivers next-generation performance, match-grade accuracy, and duty-ready reliability for the AR-15 platform. Engineered around a 12.5" Cold Hammer Forged barrel with a 1:7 twist rate, this upper offers the ideal balance of compact maneuverability and ballistic velocity.
At its core, the Super Duty MOD1 features Geissele’s Nanoweapon-coated Reliability Enhanced Bolt Carrier Group (REBCG) for smooth cycling, extreme wear resistance, and easy cleaning under heavy firing schedules. Outfitted with an M-LOK free-float handguard, an ambidextrous Geissele Airborne Charging Handle, and a suppressor-ready HuxWrx Flash Hider-QD muzzle device, this upper assembly is a turn-key solution for hard-use carbine builds.
NFA & Local Law Warning: This upper receiver features a 12.5" barrel length. Installation on a standard rifle lower receiver creates a Short-Barreled Rifle (SBR) subject to National Firearms Act (NFA) regulations, or must be configured as a AR pistol / registered firearm. Verify all state and local laws prior to assembly.
Key Features
- 12.5" Cold Hammer Forged Barrel: Precision CHF barrel with a 1:7 twist rate built for long-term durability and consistent stabilization of heavy 5.56 projectiles.
- Nanoweapon REBCG: Reliability Enhanced Bolt Carrier Group coated in Geissele Nanoweapon finish for extreme lubricity, heat resistance, and easy maintenance.
- HuxWrx Flash Hider-QD: Pre-installed suppressor-ready muzzle device designed for seamless attachment of HuxWrx/Flow-series suppressors.
- Geissele Airborne Charging Handle: Low-profile ambidextrous charging handle contoured to prevent snagging while ensuring positive charging control.
- M-LOK Free-Float Handguard: Rigid, full-length handguard offering ample M-LOK mounting real estate and continuous top Picatinny rail.
- Hard-Coat Anodized Finish: Premium black anodized finish provides superior scratch and corrosion protection.
Specifications
| Brand / Manufacturer | Geissele Automatics |
|---|---|
| Model / Series | Super Duty MOD1 Complete Upper Receiver |
| MPN | 08-545B |
| Caliber | 5.56x45mm NATO |
| Barrel Length | 12.5" |
| Barrel Type | Cold Hammer Forged (CHF), Chrome-Lined |
| Twist Rate | 1:7" |
| Muzzle Device | HuxWrx Flash Hider-QD |
| Bolt Carrier Group | Geissele REBCG (Nanoweapon Coating) |
| Charging Handle | Geissele Airborne Charging Handle (ACH) |
| Handguard / Attachment | Geissele Free-Float M-LOK Handguard |
| Receiver Compatibility | Mil-Spec AR-15 Lower Receivers |
| Finish / Color | Hard-Coat Anodized / Black |
Frequently Asked Questions
Does this complete upper receiver include a BCG and charging handle?
Yes. The Super Duty MOD1 upper arrives factory-assembled with Geissele’s Nanoweapon Reliability Enhanced Bolt Carrier Group (REBCG) and an ambidextrous Geissele Airborne Charging Handle (ACH).
Which suppressors are compatible with the factory HuxWrx Flash Hider-QD?
The pre-installed HuxWrx Flash Hider-QD is compatible with HuxWrx / OSS QD fast-attach suppressors, such as the Flow 556k and HX-QD series.
Will this upper fit on standard AR-15 lower receivers?
Yes, the Geissele Super Duty MOD1 upper is built to standard mil-spec pin dimensions and will mount directly to any standard mil-spec AR-15 lower receiver.
What are the benefits of Geissele's Nanoweapon coating?
Geissele Nanoweapon is a nickel-boron-based DLC application that provides extreme surface hardness, slickness, and corrosion resistance, reducing the friction and carbon buildup on internal BCG components.
