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Questions & Answers
Adjustable gas block?? Pinned??

Pinned block. Not adjustable

by Goody, Verified Owner, August 4, 2025
Is this pinned and welded? Is this huxwrx muzzle device? The description on this is weak

No one pins and welds muzzle devices on a 12.5 barrel. I do believe it is a Huxwrx muzzle device though

by Matthew Thwing, Verified Owner, March 8, 2025
Customer Reviews
Helpful Positive Review
Geissele 12.5 upper by Scott, Verified Owner, July 10, 2025
Absolutely perfect! Everything you expect from geissele. Fit and finish, quality, and accuracy! Can't recommend enough, don't hesitate just get it!
3/3 found this helpful
Helpful Positive Review
my primary upper by Harris R, Verified Owner, November 26, 2024
This upper is amazing. The quality is fantastic. Shooting about 1 moa with quality ammo. Shooting suppressed 100% of the time. I’ve got LWRC, LMT , DD, BCM and this is probably my favorite.
9/9 found this helpful
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Product Info for Geissele Super Duty Mod1 12.5in 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 12.5in Complete Upper:

Manufacturer: Geissele
Caliber: 5.56mm
Overall Length: 21.5 in
Barrel Length: 12.5 in
Barrel Profile: Tapered
Gas System Length: Carbine Length
Barrel Twist Rate: 1-7
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: 11.5 in
Bolt Carrier Group Included: MIL-SPEC
Magazine Included: No
Charging Handle Included: MIL-SPEC

Package Contents:

  • Geissele Super Duty Mod1 12.5in Complete Upper

Geissele Super Duty Mod1 12.5in Complete Upper Orderable Models

List of Orderable Models

  • Geissele Super Duty Mod1 Complete Upper, 12.5in, 5.56MM, Black, 08-545B , MPN: 08-545B , UPC: 810081133920 , Code: 1TO-URC-ADE15-08-545B
  • Geissele Super Duty Mod1 Complete Upper, 12.5in, 5.56MM, DDC, 08-545S , MPN: 08-545S , UPC: 810081133951 , Code: 1TO-URC-ADE15-08-545S
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