M4 Blackwater SIR Upper Receiver Group, Mod 1 with #50 M-CV RAS rail

The Blackwater SIR (Special Interest Rifle) is one of the rarest and most sought-after PMC-era clones in the community, and this Mod 1 URG replicates it down to the correct Knight's Armament #50 M-CV RAS rail configuration. Built on a flat-top M4 upper with M4 feed ramps, a 14.5" SOCOM-profile chrome lined barrel (pinned and welded where required to reach 16"+), mid-length carbine gas system, and the Knight's RAS with the factory #50 Mid-CV rail panels and flip-up front sight, this URG delivers the exact profile Blackwater contractors ran on PSD details in Iraq and Afghanistan.

Assembled by our in-house armorer with correct fasteners, torque specs, and a headspaced bolt carrier group installed. Pair it with a Colt M4 or M4A1 lower for a complete Blackwater clone that will turn heads at any match or range. A true historical tribute to the PMC era of the GWOT. Order yours today — we source these one at a time and stock is always tight.