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Calvin, yes this lower does fit .223/556/300Blk upper assemblies.

Yes that will fit any upper designed to attach to an ar15 lower. There are many calibers like 300 blackout, 224 Valkyrie, 50 beuwolf, 6.8 spc, 9 mm with a magwell conversion block, 22 long rifle, and even a bolt action 50 BMG.