Geissele Automatics 14.5" 5.56 NATO 1:7 USASOC Improved Barreled AR-15 Upper Receiver - Desert Dirt

SKU: 08-160
MPN: 08-160
Manufactured by Geissele Automatics


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NOTE: Limit 1 per household. Quantities exceeding 1 will not allow checkout.


Out of Stock


The National Firearms Act regulates the configurations of some firearms assembled with barrels under 16” long. Attaching this upper to a standard lower, without permanently pinning and welding a muzzle device to meet 16" minimum barrel length violates Federal NFA laws.

The Geissele USASOC 14.5" Improved Barreled Upper receiver lets shooters put a custom take on the Upper Receiver Group Improved (URGI) being adopted by the United States Army Special Operations Command (USASOC) forces. The stripped Upper Receiver Group Improved upper is built around a proven 14.5" cold hammer forged government contour barrel from Daniel Defense, threaded 1/2x28 for your favorite muzzle devices. A 13" Geissele Mk16 free float M-LOK handguard, designed specifically at the behest of USASOC, covers almost the entire barrel, offering a rigid and ergonomic platform for your favorite lights, lasers, sights, and other accessories.

  • Clone of the Upper Receiver Group Improved adopted by USASOC!
  • MIL-SPEC flat top M4 upper receiver with T-Marks
  • Pre-assembled with forward assist and ejection port cover
  • 13" Geissele MK16 lightweight free float M-LOK Rail with Desert Dirt finish
  • M-LOK slots on tracks for optimal accessory positioning
  • Integral QD sling swivel sockets
  • 14.5" Daniel Defense Cold Hammer Forged 41V50 chrome moly vanadium steel barrel with Government contour
  • 1:7 twist rifling stabilizes even heavy 77-grain bullets
  • Heavy duty chrome lining
  • 1/2x28 threading to accept your favorite muzzle brakes or flash hiders
  • Daniel Defense stainless steel gas tube
  • Reliable mid-length gas system reduces wear and extends service life
  • Pinned Geissele low-profile Super Gas Block

At the heart of the URGI is the 14.5" Daniel Defense mid-length barrel. Built by the masters of the cold hammer forge, this barrel provides the upper with an extended barrel life even before being expertly chrome lined for unmatched durability and accuracy. After extensive testing, USASOC requested a government contour barrel, offering an excellent balance between weight reduction and stability with select fire weapons. A mid-length gas system was selected as well, providing enhanced rifle performance and reduced felt recoil while also improving service life of the weapon systems when compared to more traditional carbine length gas systems. The 1/2x28 threaded muzzle is ready to accept your favorite muzzle brakes, compensators, and flash hiders; just be sure to permanently pin and weld the muzzle device of your choice to meet minimum 16" barrel length requirements for rifles!

Designed at the behest of USASOC, Geissele's MK16 M-LOK rail offers M-LOK mounting slots on six surfaces to offer even more modularity. Now lights, lasers, and grips can be mounted exactly where they're needed without bulky secondary or offset mounts. Like the MK14s, the MK16 also integrates QD sling swivel sockets into the handguard eliminating the necessity of adding unnecessary weight to the rifle with additional mounts. Geissele's proprietary barrel nut has an extended profile and improved interface with the receiver, ensuring the rail is not straight and true from the factory, but rock solid to boot.

Whether building out a clone or simply using it as a top-quality base, the Geissele 14.5" USASOC URGI barreled upper receiver is an option you simply can't go wrong with.


Barrel ContourGovernment
Barrel Length14.5
Barrel Material4150 Chrome Moly Steel
BrandGeissele Automatics
Caliber Gauge5.56 NATO
Gas System LengthMid-Length
Gas System TypeDirect Impingement
Handguard13 in Geissele Super Modular Rail MK16 M-LOK
Muzzle DeviceBare Muzzle
Twist Rate1:7

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

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