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Complete, Ready-To-Shoot Upper With a Full Suite of Popular Options

The Geissele Super Duty Complete AR-15 Upper Receiver comes with more options than a 1970s Cadillac, including a Surefire closed tine Warcomp, Geissele's Super Modular Rail M-LOK® handguard, and their ambidextrous Airborne charging handle. A tooth in the top rear of the SMR handguard mates with a notch in the upper receiver to prevent unwanted handguard rotation that could compromise optic and/or backup sight alignment.

Inside, the Super Duty Upper Receiver has Geissele's Reliability Enhanced Bolt Carrier Group (REBCG). The carrier is machined from extra-hard 8620 carbon steel with extended upper rails to ensure ultra-reliable feeding. (The chrome-lined gas key is, of course, "properly" staked.) The bolt itself is forged from Carpenter 158+ steel alloy, which is far stronger than standard Carpenter 158 for a service life up to 5 times longer than a plain mil-spec bolt. The strongest bolt and carrier in the world do no good if they're compromised by a failed cam pin, so the cam pin is machined from a medical-grade steel alloy called H13. The entire BCG is finished with Geissele's tough, chrome-nitride "Nanoweapon" finish that has a surface hardness similar to synthetic diamonds. Self-lubricating Nanoweapon is highly resistant to fouling and so is very easy to clean.

  • Complete AR-15 upper
  • Ready to install on a mil-spec lower
  • Chambered in 5.56 NATO (.223 Remington compatible)
  • Mid-length gas system
  • Pinned-on low-profile gas block
  • Super Modular Rail M-LOK handguard
  • Reliability Enhanced Bolt Carrier Group (REBCG)
  • Ambidextrous Airborne charging handle

Each Super Duty Complete Upper Receiver is fitted with a cold hammer-forged 14.5" carbine barrel manufactured by Geissele in their own factory in North Wales, Pennsylvania (not outsourced!). Chambered in 5.56 NATO, it has a chrome-lined bore and a phosphate exterior finish. The mid-length gas tube reduces the velocity of the gas for less violent, more reliable operation of the bolt/carrier group. The Geissele Super Gas Block is pinned to the barrel, so it's not going to move - no matter how many rounds you cycle through this bad boy!

GEISSELE AUTOMATICS LLC - AR-15 SUPER DUTY NANO COMPLETE UPPER RECEIVERS 5.56MM

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Geissele

Length: 10.3"

Muzzle: Surefire Closed-Tine Warcomp, ...

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Cartridge: 5.56 mm NATO

Finish: DDC

Style: Complete

Contour: Geissele

Length: 10.3"

Muzzle: Surefire Closed-Tine Warcomp, ...

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Geissele

Length: 11.5

Muzzle: 1/2-28, ...

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Cartridge: 5.56 mm NATO

Finish: DDC

Style: Complete

Contour: Geissele

Length: 11.5

Muzzle: 1/2-28, ...

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Geissele

Length: 14.5"

Muzzle: Surefire Warcomp, ...

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Cartridge: 5.56 mm NATO

Finish: DDC

Style: Complete

Contour: Geissele

Length: 14.5"

Muzzle: Surefire Closed-Tine Warcomp, ...

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: Geissele

Length: 16"

Muzzle: Surefire Closed-Tine Warcomp, ...

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Cartridge: 5.56 mm NATO

Finish: DDC

Style: Complete

Contour: Geissele

Length: 16"

Muzzle: Surefire Closed-Tine Warcomp, ...

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Length: 18"

Twist: 1-7

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Cartridge: 5.56 mm NATO

Finish: DDC

Style: Complete

Length: 18"

Twist: 1-7