URG-I全称是 “改进型上机匣组（Upper Receiver Group, Improved）”，该项目是美国陆战特种作战司令部（USASOC）在2017年发起的一项对现役的 SOPMOD II 进行升级改造的招标计划。

Aug 1, 2019 · Let’s get straight to it: “URG-I” stands for “Upper Receiver Group — Improved.” It’s the “new” M4. The URG-I is available from Geissele Automatics (pronounced “guy-SUH-lee”) as a complete upper assembly (not a complete gun). The URG-I resulted from a United States Army Special Operations Command (USASOC, no more “SOCOM”) contract project.

URG-I来自于美国特种作战司令部，海军陆战队系统司令部和空军安保部队中心曾经联合参与过的M4卡宾枪改进项目——“改进型模块化步枪（Improved Modular Rifle，以下简称IMR）”。

An “Urgie” is an AR15 complete upper assembly available through Geissele Automatics and it’s also the latest evolution of the M4. The URG-I (Upper Receiver Group, Improved) resulted from a USASOC contract project (United States Army Special Operations Command; no more “SOCOM”) to develop an upgraded M4 for issue.

With the advent of the USASOC URGI, that quintessentially American silhouette has changed forever. The Geissele Super Modular Rail MK 16 handguard, hammer forged barrel, and mid …

With the advent of the USASOC URGI, that quintessentially American silhouette has changed forever. The Geissele Super Modular Rail MK16 handguard, hammer forged barrel, and mid-length gas system work in concert for a package that …

Designed to take the full rigors of the M855A1 (AB57) ammunition, the USASOC URGI also takes full advantage of its capabilities. Once the USASOC URGI is installed on an existing system, it essentially makes for a brand new weapon. The USASOC URGI is a near-clone upper receiver group currently going into service with USASOC. Features.

Geissele Automatics, URG-I, Near Clone, Complete Upper Receiver, 556NATO, 11.5" Barrel, 1:7 Twist, Pinned and Welded Surefire 4 Prong Flash Hider, Desert Dirt Color 10.5" SMR MK16 M-LOK Free Float Handguard, Desert Dirt Color Geissele Airborne Charging Handle, Geissele Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black, Includes Super 42 Braided Wire Buffer Spring and ...