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Customer Reviews
Helpful Positive Review
geissele super duty MOD1 by Seth Mello, Verified Owner, March 15, 2024
Great product. The muzzle device is not pinned and welded. It’s a nice qd adapter but wasn’t compatible with my suppressor
1/3 found this helpful
Helpful Positive Review
No hiccups! by Hog, Verified Owner, July 1, 2025
I just put 500 rounds through mine. Not 1 failure, either with my Huxwrx can or without . I know it's not the quietest suppressor, but it's a laser with it. We were shooting at a steel plate at 100 yards. I hit it 250 times, with a Romeo 5. The othe...
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1/1 found this helpful
Helpful Positive Review
Geissele Super Duty mod 1 10.3in upper by Jose Nieves, Verified Owner, March 8, 2025
Geissele is second to none in the firearms industry! This upper is great and OP delivered fast and as promised! Price was great with the deals and coupons offered here! Thank you!
1/1 found this helpful
Most Recent Reviews
Perfect for custom AR by Edgar, Verified Owner, July 19, 2025
Found the fit and finish to be very good, 500 rounds malfunction free. Time will tell on reliability, but so far so good. Overall I'm happy with it.
Read All 4 Reviews
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Product Info for Geissele Super Duty Mod1 10.3in Complete Upper

The Geissele Super Duty MOD1 Upper (Complete) features the latest in weapon technology available exclusively from Geissele Automatics. This 10.3in complete upper chambered in 5.56mm features a nanoweapon-coated HUXWRX Flash Hider-QD muzzle device mounted to an 10.3in 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, 9.3in 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 10.3in Complete Upper:

Manufacturer: Geissele
Caliber: 5.56mm
Overall Length: 19.5 in
Barrel Length: 10.3 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: 9.3 in
Bolt Carrier Group Included: MIL-SPEC
Magazine Included: No
Charging Handle Included: MIL-SPEC

Package Contents:

  • Geissele Super Duty Mod1 10.3in Complete Upper

Geissele Super Duty Mod1 10.3in Complete Upper Orderable Models

List of Orderable Models

  • Geissele Super Duty Mod1 Compelte Upper, 10.3in, 5.56MM, Black, 08-543B , MPN: 08-543B , UPC: 810081133753 , Code: 1TO-URC-ADE12-08-543B
  • Geissele Super Duty Mod1 Compelte Upper, 10.3in, 5.56MM, DDC, 08-543S , MPN: 08-543S , UPC: 810081133760 , Code: 1TO-URC-ADE12-08-543S
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