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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 without muzzle device, charging handle, or bolt carrier group permitting you to customize with your choice of these components.

To begin, Geissele installs a 14.5" Daniel Defense barrel optimized to handle the full rigors of the new M855A1 (AB57) ammunition with a 1-7” rate of twist and a 1-2/28 threaded muzzle at the end. 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.

Stripped 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

NFA DISCLAIMER/WARNING: The Stripped URGI Upper Receiver has a barrel length of 14.5” and all NFA laws apply.


Big Book Catalog, Issue:72, Page:005

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

Discontinued by the Factory

Product has been discontinued and no longer available.