Geissele Super Duty Complete Upper Receiver Group – 16″


DDC (Desert Dirt Color)

Product Description

The Geissele Super Duty Upper (Complete) features the latest in weapon technology available exclusively from Geissele Automatics. This 16” complete upper chambered in 5.56mm features a Nanoweapon coated Surefire Closed-Tine Flash Hider mounted to an 16” 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 Geissele length gas system and Geissele Super Compact Gas Block with bomb-proof installation ensures reliability and optimal performance in extreme conditions.

Included is a brand new, 15” 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 13.5” 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 bar stock. 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.

All of these technologies and advancements combine to bring to market a true next-gen upper for the AR-15 platform. The Super Duty Complete Upper from Geissele Automatics offers unmatched performance, accuracy and reliability.


  • Length: 16″
  • Caliber: 5.56MM
  • Color: Black or 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: 15″ SMR MK16
  • Barrel: 16″ Geissele Barrel, CHF, Chrome Lined, 1-7 Twist – Geissele Profile
  • Gas System: Geissele Length
  • Gas Block: Super Compact Gas Block
  • Charging Handle: Airborne Charging Handle
  • Muzzle Device: Nanocoated Closed-Tine Flash Hider





Technical Information


5.56 NATO / .223 Remington

Color / Pattern




Firearm Compatibility

Barrel Twist




Thread Pitch

1/2 x 28

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit

Customer Reviews

Based on 1 review
Excellent upper for the price

I have no complaints with this upper. It's accurate, lightweight, and reliable. Geissele includes a bunch of nice touches over other uppers at a similar price point(pinned gas block, indexed receiver/handguard, improved cam pin, etc.).