URG-I
U.S. special operations M4A1 upper receiver upgrade
URG-I
The Upper Receiver Group - Improved (URG-I), also styled URGI, is an upgraded upper receiver assembly for the M4A1 carbine adopted by United States Army Special Operations Command (USASOC). First fielded in 2018, it replaces the upper receiver, barrel and handguard of the SOPMOD Block II M4A1 with lighter, longer-lived components while retaining the existing M4A1 lower receiver. Because only the upper assembly is changed, rifles fitted with the URG-I retain the M4A1 designation. The kit's principal features are a Daniel Defense cold hammer-forged barrel that returns to the lighter "government" profile, a mid-length gas system, and a lightweight Geissele Automatics free-floating handguard using the M-LOK mounting standard. The package was optimized for the U.S. military's M855A1 Enhanced Performance Round.
Read on Wikipedia · Image U.S. Marine Corps photo by Cpl. William Chockey, Public domain
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