The A4 Tactical is Rock River's standard-configuration AR-15 built to the M16A4 flat-top specification with a 16-inch barrel and a free-float handguard upgrade over mil-spec. It is the baseline RRA rifle — reliable, accurate, and priced for volume buyers who want quality without custom-shop pricing. Thousands of these rifles are in daily use at training facilities and in private collections. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2004, USA Weight: 96 oz Overall length: 32" Status: Active Intended use: Home Defense, Training, Tactical