SR-15 Mod 2 16 inch M-LOK Rifle #31900

Knight's Armament Company's SR-15 E3 Mod 2 (Part No. 31900) represents the pinnacle of 5.56 NATO AR-15 design from the company that helped define modern special operations rifle standards. The 16-inch cold hammer-forged, chrome-lined barrel uses KAC's proprietary mid-length gas system, which reduces felt recoil and bolt carrier velocity compared to carbine-length systems while maintaining the reliability needed in austere environments. The E3.2 round-lug bolt features dual ejectors and a redesigned cam pin that dramatically extends service life beyond standard bolt designs -- KAC rates it for significantly more rounds before parts replacement is required.

The URX4 M-LOK handguard is a single-piece free-float design machined from 6061 aluminum, providing a stable mounting platform for NVG-compatible optics, suppressors, and accessories while eliminating the barrel-contact flex of older quad-rail designs. A KAC-refined two-stage trigger requires 4.5 pounds for the second-stage break, bridging precision rifle accuracy and defensive reliability. The SR-15 E3 Mod 2 is one of the few production AR-15 rifles that commands a premium not for marketing but for genuine engineering refinement. It is the choice of serious shooters who understand what it costs to build a rifle correctly from the beginning.