Dramatic improvements have been made to the ArmaLite AR-30A1 carbine. The AR-30A1 features muzzle brake threads, through-hardened receiver, bolt-mounted safety mechanism locks the firing pin to the rear, durable metal cheekpiece, comfortable elastomeric cheekpiece pad, multiple sling installation locations, interchangeable buttstocks, and military grade anodizing and phosphating finishes for corrosion resistance.