![]() ![]() The MOD 1 is their QD model, with a standard HUB base that accepts the KeyMo adapter. The suppressor mounted here is a Witt Machine & Tool MOD 1, an ultra-compact suppressor measuring just 51/4 inches long, with a wide-body design 1 5/8 inches in diameter. While it does cost you one M-LOK slot at the rear of the tube, the extra material increases rigidity to support peripheral devices like weapon lights and IR laser/illuminator units. The Griffin barrel is sheathed in a 10.5-inch Midwest Industries Night Fighter handguard, everything you’d expect from Midwest Industries with the added benefit of a reinforced back end and lengthened 2.25-inch steel barrel nut. Since all these units work primarily in close-quarters environments and run suppressors almost full-time, the shorter barrels offer tangible benefits. ![]() Likewise, FBI ammunition testing revealed a small enough performance difference to standardize 11.5-inch uppers across their SWAT teams and HRT. Since that time, our sources tell us USASOC has moved entirely away from the 14.5-inch URG-I in favor of issuing the 11.5 across the board. Originally, the URG-I program settled on a combination of 11.5- and 14.5-inch uppers, issued in a mixed ratio based on mission and shooter preference. The result was refitting existing M4s with uppers that leverage superior quality parts, enhancing the capability of both the M4 and the 5.56mm round. USASOC’s URG-I program (Upper Receiver Group, Improved) sought to equip Ranger Regiment and Special Forces Groups with the best possible assault rifle without changing calibers or selecting an entirely different rifle. Army Special Operations Command and FBI’s special tactical teams, which include both their regional SWAT teams and their national-asset Hostage Rescue Team. We specifically chose the 11.5-inch length based on the selections of two major SOF sources: U.S. 223 Wylde to accommodate the widest array of commercial and NATO-spec ammunition. They’re turned to an M4 barrel profile, with longitudinal flutes to reduce weight and increase cooling. ![]() Well played, Griffin.) The HEDP barrels are 416R stainless, polished, and hand-lapped before they’re finished in black nitride to optimize service life while still having match-grade tolerances. On the front end, we installed a Griffin Armament 11.5-inch High Endurance, Dual Purpose barrel. ![]() On the back end, we attached a PWS-enhanced buffer tube and ratcheting castle nut with QD-socket endplate. ![]()
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