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Build Your Rifle on the Upper Receiver Used By USASOC - A Clone (Almost!)

The Geissele URGI AR-15 upper receiver is a near clone of the "Upper Receiver Group Improved" currently going into service with USASOC (United States Army Special Operations Command). It offers a host of improvements over the standard "mil-spec" M4 upper we’ve grown so accustomed to - and it will transform your AR-15 shooting experience. Brownells offers the Geissele URGI upper in "Stripped" form and a Complete model ready to snap onto the lower of your choice and hit the range. Let’s look at the Complete URGI first.

To begin, Geissele installs a 14.5" Daniel Defense barrel optimized to handle the full rigors of the new M855A1 (AB57) ammunition, with a Surefire SF4P four-prong flash hider pinned up front. Functioning as a highly effective flash suppressor, the URGI’s SF4P four-prong flash hider also serves as a rock-solid adapter for a Surefire SOCOM 5.56 Fast-Attach sound suppressor (not included). In between, a mid-length gas system with low-profile gas block ensures more reliable cycling than a standard carbine-length tube.

Each URGI is fitted with the handguard Geissele designed specifically for USASOC, the MK 16 M-LOK™ Super Modular Rail handguard with a full-length Picatinny top rail and lotsa slots for other accessories. T-markings are engraved on the rail but not painted white to help keep the rifle unobtrusive. The URGI Upper Receiver is also outfitted with Geissele’s ambidextrous Airborne Charging Handle, with easy-to-grasp levers that are deeply checkered to ensure a confident grip when you need to charge the chamber in a hurry.

Complete URGI upper receiver feature summary:

  • High quality mil-spec receiver with forward assist, shell deflector & ejection port cover
  • Daniel Defense 14.5" barrel with 1-7" rifling & 1/2"-28 tpi muzzle threads
  • Mid-length gas system with low-profile, stainless steel, Nitrided gas block (pinned)
  • Geissele MK 16 Super Modular Handguard
  • Pinned-and-welded Surefire SF4P four-prong flash hider
  • Geissele Airborne Charging Handle
  • Mil-spec M4 carbine bolt/carrier group

NFA DISCLAIMER/WARNING: The Complete URGI upper receiver contains a permanently pinned and welded muzzle device. This makes the muzzle device an integral part of the barrel to make the barrel meet the 16" minimum length requirement, and requires no registration or tax stamp from the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE). Removal or modification to the muzzle device, will result in converting this item to a regulated item by the National Firearms Act (NFA). Additional state and local restrictions may apply. It is the sole responsibility of the buyer to comply with any and all applicable laws.


Big Book Catalog, Issue:71, Page:005

GEISSELE AUTOMATICS LLC - AR-15 USASOC UPPER RECEIVER GROUP IMPROVED (URGI) 5.56 M-LOK

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Cartridge: 5.56 mm NATO

Finish: Black

Style: Stripped

Contour: Government

Length: 14.5

Twist: 1-7

Online Only
In Stock

Cartridge: 5.56 mm NATO

Finish: Black, DDC

Style: Complete

Contour: Government

Length: 16, ...

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