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David, yes and you would need the Standard Model most likely. Details here : https://www.browning.com/products/shooting-accessories/misc/recoil-hawg-muzzle-brake.html

David, no, your radical firearms 300 blackout has a 5/8x24 thread pitch. This works with M13 x 1.25 or M13 x .75 threaded muzzles. So unfortunately this wouldn't fit your 300 blackout. Sorry but hope this helps.