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What are we asking?
Who was the first person to take 5.56mm brass, cut it down, and open it to 30 cal?
1969 for the Air Force's Colt IMP project - though it was 30mm case length so that with the bullet they wanted it would fit into a 221 Fireball sized gun.
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R&D for AAC
Last edited by rsilvers; 04-12-2011 at 12:20 PM.
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