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URGI Upper Receivers

URGI Upper Receiver Groups — Geissele URGi and USASOC Uppers

The URGi (Upper Receiver Group Improved) is the current USASOC standard upper receiver for the M4A1 — built around the Geissele MK16 M-LOK handguard, a 14.5" government-profile barrel, and an enhanced bolt carrier group. It replaced the Block II SOPMOD upper across Army SOCOM units and represents the current state of the art in military M4A1 upper configuration.

CCC's URGi upper receiver groups are built in partnership with Potomac Armory to the USASOC specification. We also carry the Geissele factory upper assemblies and select Geissele URGi uppers that are clone-correct or near-clone representations of what SOCOM units are running. These drop onto any Mil-Spec M4A1 lower.

Can I put a URGI upper on a standard lower?
Yes. The URGi upper receiver group uses the standard Mil-Spec upper receiver interface and drops onto any M4/AR-15 Mil-Spec lower — Colt, Daniel Defense, LMT, BCM, or any other Mil-Spec lower. The only consideration is the 14.5" barrel, which requires either a pinned and welded muzzle device to reach the 16" legal minimum, or an NFA SBR registration to use at its actual length.