The Rock River Arms LAR-15 NM A4 (National Match A4) is a competition-tuned variant with a 20-inch Wilson Arms stainless barrel, two-stage NM trigger, and match-grade bolt carrier group. Built specifically for NRA High Power competition where the combination of match trigger and precision barrel is required to compete at the top level. Includes RRA's NM front sight adjustment tool. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2006, USA Weight: 8.75 oz Overall length: 40" Status: Active Intended use: Precision Shooting, Competition