Geissele Automatics Super Duty MOD1 Complete Upper Receiver 556 12.5″ CHF 08-545S

Geissele Super Duty MOD1 08-545S

Super Duty MOD1 Complete Upper, 12.5″, 5.56mm – DDC
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.

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 individually 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.

Geissele Super Duty MOD1 08-545S

Super Duty MOD1 Complete Upper, 12.5″, 5.56mm – DDC Specification
OVERALL LENGTH: 21 1/2″
WEIGHT: 4 lbs
CALIBER: 5.56MM
COLOR: DDC
RECEIVER: Super Duty Upper w/ cam Pin cut-out
BOLT CARRIER GROUP: Nanoweapon Reliability Enhanced BCG
BOLT: Geissele Stressproof Bolt with Asymmetric Cam Pin
RAIL: 11.5″ SMR MK16
BARREL: Geissele Barrel, CHF, Chrome Lined, 1-7 Twist – Geissele Profile
GAS SYSTEM: Carbine Length
GAS BLOCK: Super Compact Gas Block
GAS PORT SIZE: .065
CHARGING HANDLE: Airborne Charging Handle
MUZZLE: HUXWRX Flash Hider-QD 556

What is Geissele Nanoweapon?

Geissele Nanoweapon (also known as Picatinny DSL) is a family of Durable Solid Lubricant coatings which was developed by ARDEC. It is available exclusively from Geissele Automatics. We continued the development of Picatinny DSL so that its level of corrosion, wear and abrasion resistance is currently unmatched among firearm coatings. Nanoweapon is applied at low temperatures so that the underlying metallurgy of the part is non effected by the application process. Our coating also has a surface hardness roughly equivalent to synthetic diamond. This makes Geissele Nanoweapon harder than sand, easily rejecting carbon and making cleaning a breeze, on top of allowing the firearm to operate normally with less lubrication.