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Customer Reviews
Helpful Positive Review
First good AR by Jon Beck, Verified Owner, May 27, 2025
Always bought cheap AR’s before because an AR is an AR. I was very wrong. This Geissele upper is a super smooth shooting rifle. Double taps at 50 yards are cake now. Love everything about this upper. Pinned gas block, BCG that doesn’t want to quit. I...
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3/3 found this helpful
Most Recent Reviews
Great product by shane, Verified Owner, January 1, 2026
Really nice upper. Fast shipping and solid product. Can’t go wrong with G$.
Most Recent Reviews
Best AR upper available by walking tall, Verified Owner, November 20, 2025
Search long and hard to find a high quarry AR upper fit and finish and materials used are top notch perfect upper for John purpose raffle
Most Recent Reviews
GEISSELE SUPER DUTY UPPER 13.9 by Swhaib Beitazzam, Verified Owner, June 6, 2025
Incredible upper beautiful color best ar I ever had. Shoots really well and very smooth. Overall fantastic quality for the upper.
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Product Info for Geissele Super Duty Mod1 5.56mm, 13.9 inch Complete Upper

The Super Duty MOD1 is the current evolution of the Super Duty® platform, incorporating continuous design development to provide superior ergonomics and modularity while maintaining the legendary balance of performance and reliability.image

Foundational to the renowned quality and performance of this Super Duty system is the in-house produced Cold Hammer Forged, chrome-lined barrel and Nanoweapon-coated Reliability Enhanced Bolt Carrier Group. Both the Geissele CHF barrel and Forged Stressproof Bolt® are High-Pressure Tested (HPT) and Magnetic Particle Inspected (MPI), and work in concert to achieve unmatched dependability with match-grade accuracy. The Super Duty features a precisely balanced gas system, including the bomb-proofed Super Gas Block and fine-tuned gas port sizing, especially when combined with the Geissele Super 42 braided buffer spring (sold separately). These purposefully selected components minimize felt recoil while maintaining reliable cycling, even in adverse conditions. The MOD1 features the signature Nanocoated HUXWRX Flash Hider-QD muzzle device, offering seamless compatibility with the innovative HUXWRX FLOW series.

Rounding out the MOD1 complete upper receiver group, the well-vetted center-tab mated MK16 rail features stainless steel QD inserts to reinforce sling attachment. The Airborne Charging Handle provides ambidextrous use and accessibility and while maintaining a lower profile to eliminate snagging on gear.

Manufactured with confidence and without compromise, the Super Duty MOD1 adds value to the platform while continuing the reputation for excellence.

WARNING: California`s Proposition 65

Specifications for Geissele Super Duty Mod1 5.56mm, 13.9 inch Complete Upper:

Manufacturer: Geissele
Caliber: 5.56mm
Overall Length: 23.25 in
Barrel Length: 13.9 in
Barrel Profile: Tapered
Gas System Length: Mid Length
Barrel Twist Rate: 1-7
Firearms Threads Per Inch: 1/2x28
Muzzle Device: Nanoweapon-coated HUXWRX Flash Hider- QD 556
Finish: Type 3 Hardcoat Anodize
Fabric/Material: Aluminum & Steel
Handguard Length: 12.9 in
Bolt Carrier Group Included: MIL-SPEC
Charging Handle Included: MIL-SPEC

Package Contents:

  • Geissele Super Duty Mod1 13.9in Complete Upper

Geissele Super Duty Mod1 5.56mm, 13.9 inch Complete Upper Orderable Models

List of Orderable Models

  • Geissele Super Duty Mod1 Complete Upper, 13.9in, 5.56mm, Black, 08-546B , MPN: 08-546B , UPC: 810081133968 , Code: 1TO-UFH-ADE16-08-546B
  • Geissele Super Duty Mod1 Complete Upper, 13.9in, 5.56MM, DDC, 08-546S , MPN: 08-546S , UPC: 810081133999 , Code: 1TO-UFH-ADE16-08-546S
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