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This weekend I traded for a really nice 300 blackout pistol. After looking at what the ammo will cost me to shoot long-term, I'm wondering what exactly I would need to do to convert this to shoot either .223 or the cheap 7.62x39mm rounds? I'm a former Marine who shot a ton of M16's but the ins and outs of these ARs are a bit much for this old guy. I know there are a ton of AR builders on here so a little help will be greatly appreciated. If you can email me at [email protected] or text/call at 503-858-9941 I would appreciate it. Thanks.