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Thread: Group Buy 300 Blackout. (completed)

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  1. #31
    Graduate polebarn's Avatar
    Join Date
    Apr 2013
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    12,874
    so, what's the rule on putting a 300blk upper on a .223 marked lower?
    You might need the .077 adapter kit.
    Last edited by Tack Driver; November 27th, 2017 at 08:48 PM.

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