The Knight's Armament Stoner 63A is a modern production variant of Eugene Stoner's modular weapons system designed to reconfigure between rifle, carbine, and light machine gun. KAC produced limited quantities in the 1990s for collectors and historically minded shooters. The 20-inch rifle configuration represents the original Stoner 63 as tested by US special operations forces in Vietnam. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 1963, USA Weight: 176 oz Overall length: 39" Status: Discontinued Military use: Yes Intended use: Special Operations / Collector