Ruger Mini-14, gas-operated semi-auto in 5.56 NATO with 18.5-inch barrel. Ranch rifle scaled down from M14 design. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 20 Year introduced: 1973, USA Weight: 6.75 oz Overall length: 37.25" Status: Active Intended use: Hunting, Service, Farm