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。 该项目的出现，一方面是因为近些年来不再流行四面导轨的护木设计（详见我发表在其他平台的文章 《皮卡汀尼导轨与两种后来竞争者》），有一些士兵或单位会自己购置其他护木去更换丹尼尔防务公司（DD）的护木，如 TORY 的ALPHA，或Geissele的SMR MK4等等。 因此USASOC干脆 …

2019年8月1日 · 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. It was completed and released mid-2018, and I got mine in early fall of that year.

URG-I shoots softer than the BOB’s 16.5" Krieger barrel. The standout departure in this gun compared to previous M4 configurations is the mid-length gas system. It is the hands-down best thing ever for a carbine. The mid-length was incorporated in part as a hedge against the “full rigors” — as says the literature — of the M855A1 (AB57) ammo.

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 …

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-length gas system work in concert for a package that …

2024年5月15日 · 政府轮廓枪管源于美国海军陆战队在M16A2项目中的技术失误。而它被用于URG-I项目，主要是因为Daniel Defense不生产中等长度导气系统的SOCOM轮廓14.5英寸枪管。政府轮廓的一个显著特征是导气口前的部分比后部更粗，这与SOCOM轮廓恰好相反。

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 carbine gas system work in concert for a package that delivers measurable increases in hit probability.