Brand: Geissele Automatics
Model: Super Duty MOD1
Caliber: 5.56 NATO
Platform: AR-15
Barrel: 13.9" Geissele Heavy Barrel, CHF, Chrome Lined
Color: Black
Finish: Anodized
Gas System: Mid-Length
Muzzle Device: HUXWRX QD Flash Hider, Pinned and Welded
Muzzle Thread: 1/2-28
Twist: 1:7
Receiver: Super Duty Upper w/ cam Pin cut-out
Handguard: 12.9" SMR MK16 w/ Geissele Center Tab
Attachment Style: M-Lok
BCG: Nanoweapon Reliability Enhanced BCG
Charging Handle: Airborne Charging Handle
Weight: Approx 4 lbs 3 oz
Length: 23 1/4"

Features

The Super Duty MOD1 HBAR takes the Geissele Super Duty platform even further with a cold hammer forged, chrome-lined heavy barrel built to handle sustained fire while maintaining exceptional accuracy and reliability.

At its core is the Nanoweapon-coated Reliability Enhanced Bolt Carrier Group and Forged Stressproof Bolt, both HPT/MPI-tested for maximum durability. The optimized gas system—featuring a bomb-proof Super Gas Block and tuned port sizing—delivers smooth, consistent cycling, especially when paired with the Super 42 buffer spring (sold separately).

The upper includes the Nanocoated HUXWRX Flash Hider-QD for seamless FLOW suppressor compatibility, a robust MK16 rail with QD sling points, and the Airborne Charging Handle for snag-free, ambidextrous use.

Built with no compromises, the MOD1 HBAR offers rock-solid performance, precision, and reliability in a complete upper package.

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.