They made a weapon system called a Stoner 63 chambered in .223 rem/5.56mm . I would like some info on this gun. He gave me one in semi-auto only that has not been fired. He told me they only made 250 civy models just for the employees. I remember him saying something about the Navy SEALS taking this weapon system to Viet Nam. What you have may be hard to value, but I suspect there are Colt and Stoner collectors who would kill for your unfired, very rare, semi-auto piece.There is a full auto Stoner 63 in the collection at the Springfield Armory that was valued at $13,500 about 20 years ago before it was transferred to the Armory. I'd insure that piece for at least $20,000 and I'd buy it a gun safe if you intend to keep it. If you intend to sell, you'll need a very competent and very experienced dealer.

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Gun Safes