Geissele 11.5 UPPER AR-15 Super Duty Pistol

The Geissele 11.5 Upper Super Duty Upper features the latest in weapon technology available exclusively from Geissele Automatics. This complete upper chambered in 5.56mm features a Nanoweapon coated Surefire Closed-Tine Flash Hider mounted to a Mag Phosphated, CHF, Chrome Lined 1-7 twist barrel. Geissele barrels are precision machined and cold hammer forged utilizing the highest quality materials at their state of the art facility. The carbine length gas tube and Geissele Super Compact Gas Block with bomb-proof installation ensures reliability and optimal performance in extreme conditions.

Included is a Super Modular Rail MK18 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 REBCG, Reliability Enhanced Bolt Carrier Group. This Nanoweapon coated BCG is machined from mil-spec 8620 steel, with 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 REBCG also features extended upper rails, providing greater stability and dramatically increasing feeding reliability.


Geissele 11.5 ar upper 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. Geissele 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 affected by the application process. DSL 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.

Geissele 11.5 UPPER
Geissele 11.5 UPPER

The REBCG comes with the Geissele Stressproof Bolt. Made from Carpenter 158+, directly developed with Carpenter Steel metallurgists to create a material that is clean Geissele 11.5 UPPER and has less impurities. This makes the Geissele Stressproof bolt stronger and more fatigue resistant. The Geissele Stressproof bolt is also forged, not machined from barstock. This allows Geissele machinists 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.


  • Super compact gas block
  • Airborne charging handle
  • Surefire Flash Hider

Product Information

Cartridge5.56x45mm NATO
Barrel Length11.5 Inches
Twist1:7 Inches
Barrel ContourGeissele
Barrel FinishBlack Phosphate
Chrome LinedYes
Gas Block Diameter0.75 Inches
Gas System LengthCarbine
M4 Feed RampsYes
Upper Receiver TypeA3 Flat-Top
Handguard10.5” Super Modular Rail MK16
Bolt Carrier Assembly IncludedYes
Muzzle DeviceSurefire Closed-Tine Warcomp
Country of OriginUnited States of America
Compatible WithAR-15

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