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aac 300 blackout
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  1. AR-15 Talk
    I recently bought a Wilson 16" barrel upper chambered in AAC 300 Blackout. I plan to initially mount it on my Colt 6940 lower to see if I really like the cartridge. Since I'm currently here gunless in Korea, I won't be able to try it out until I get back to the States when I retire at the end...
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