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By 1974 the Ruger Mini-14, chambered in .223 Remington, was released to the general public. The mini-14 is inspired from the classic M-14, a rugged magazine fed semi-automatic carbine rifle. It has an investment cast heat-treated receiver and a Garand breech bolt locking system with a short-stroke fixed-piston gas system. The well designed self-cleaning system vents unburned powder keeping the system clean and running properly. This is a noteworthy advantage over the AR-15 gas impingement system, which vents spent powder residues and gases directly into the receiver.