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Questions & Answers
Is the muzzle pinned and welded?

Doubt it. The NFA length would be well under 16" even if it was. Usually a 14.5" pin and weld is compliant with the right muzzle device length.

by YankeeBluejeans, Verified Owner, October 17, 2025
What charging handle is included with this?

Mine came with the Geissele charging handle.

by JBR, Verified Owner, July 12, 2025
Customer Reviews
Helpful Positive Review
Great Upper with one Caveat by Alex, Verified Owner, September 15, 2025
We all know this is a great upper and it is. The main issue is that they are using red loctite on the muzzle break. Even with map gas and yanking on it it took forever to get off and the handguard took some nicks. Not sure whose idea this was but I w...
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1/2 found this helpful
Most Recent Reviews
For God and Country by Code, Verified Owner, December 23, 2025
You can feel the quality and the care put into producing this item, Geissele does not miss a beat. I also own a 14.5 super duty, the rifle is a work horse and just holding it in my hands is a privilege.
Most Recent Reviews
little on the heavy side by bob, Verified Owner, December 9, 2025
Weighs about the same as BCM ELW 16”, shoots smooth and accurate.
Most Recent Reviews
great upper by abr7890, Verified Owner, December 4, 2025
One of the best uppers I’ve ever used. Run suppressed with a Huxwrx. Can’t beat it
Most Recent Reviews
Geissele 11.5 by Dave, Verified Owner, September 18, 2025
Perfect...attention to detail was just what you would expect. Shipping was timely. Would definitely recommend. M
Most Recent Reviews
Always have what I want in stock. by Bulletcatcher, Verified Owner, September 13, 2025
There's been multiple times we're the other guys dont have what I want in stock but you do.I can always rely on your selection thank you.
Read All 10 Reviews
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Product Info for Geissele Super Duty Mod1 11.5in Complete Upper

The Geissele Super Duty MOD1 Upper (Complete) features the latest in weapon technology available exclusively from Geissele Automatics. This 11.5in complete upper chambered in 5.56mm features a nanoweapon-coated HUXWRX Flash Hider-QD muzzle device mounted to an 11.5in Manganese Phosphate coated, CHF, Chrome Lined 1-7 twist barrel. Our barrels are precision machined and cold hammer forged utilizing the highest quality materials at our state of the art facility in North Wales, PA. The carbine length gas tube and Geissele Super Compact Gas Block with bomb-proof installation ensures reliability and optimal performance in extreme conditions.image

Included is a brand new, 10.5in Super Modular Rail MK16 that mates to the upper via a center aligning tab removing any chance of rail rotation. This rail is a variant of the 13.5in SMR MK16, currently fielded by USASOC and renowned by operators for their performance and comfort.

Also included is the Geissele Reliability Enhanced Bolt Carrier Group. This Nanoweapon coated BCG features a properly torqued and staked, chrome lined gas key. The Cam Pin is machined from advanced, medical steel known as H13 which is also coated with Nanoweapon for maximum corrosion and wear resistance. The Geissele Reliability Enhanced Bolt Carrier Group also features extended upper rails, providing greater stability and dramatically increasing feeding reliability.

The Geissele Reliability Enhanced Bolt Carrier Group comes with the Geissele Stressproof Bolt. Made from Carpenter 158+, directly developed with Carpenter Steel metallurgists to create a material that is cleaner and has less impurities. This makes our Stressproof bolt stronger and more fatigue resistant. The Geissele Stressproof bolt is also forged, not machined from barstock. This allows us to optimize the grain structure of the steel to yield a bolt capable of 5 times the life of a mil-spec bolt. Each bolt is rigorously inspected, high pressure tested, mag particle inspected and Nanoweapon coated.

WARNING: California`s Proposition 65

Specifications for Geissele Super Duty Mod1 11.5in Complete Upper:

Manufacturer: Geissele
Caliber: 5.56mm
Overall Length: 20.75 in
Barrel Length: 11.5 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, Steel
Handguard Length: 10.5 in
Bolt Carrier Group Included: MIL-SPEC
Magazine Included: No
Charging Handle Included: MIL-SPEC

Package Contents:

  • Geissele Super Duty Mod1 11.5in Complete Upper

Geissele Super Duty Mod1 11.5in Complete Upper Orderable Models

List of Orderable Models

  • Geissele Super Duty Mod1 Complete Upper, 11.5in, 5.56MM, Black, 08-544B , MPN: 08-544B , UPC: 810081133722 , Code: 1TO-URC-ADE14-08-544B
  • Geissele Super Duty Mod1 Complete Upper, 11.5in, 5.56MM, DDC, 08-544S , MPN: 08-544S , UPC: 810081133739 , Code: 1TO-URC-ADE14-08-544S
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