The Stoner 63 is an American modular weapons system designed by Eugene Stoner in the early 1960s. It was produced by Cadillac Gage and used in very limited numbers in Vietnam by members of the United States Navy Seals and U.S. Marines.
The first working prototype was chambered in 7.62x51mm NATO and completed in 1962. It was designated the Stoner M69W (for no other reason than when turned upside down it reads the same, symbolizing Stoner's vision of a fully invertible receiver). A second prototype called the Stoner 62 was fabricated before the team decided to focus on the promising new 5.56x45mm small caliber high-velocity cartridge, as it appeared the new round was gaining mainstream military approval. At that time the weapon became known as the Stoner 63. No more than 200 guns were manufactured at the Costa Mesa facility before production was transferred to the Cadillac Gage plant in Warren, Michigan. The weapon is covered under U.S. Patent 3,198,076
Stoner 63A in use in Vietnam by Navy Seals
YouTube Video: Stoner 63A with 100% tracer
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