I've used the .30 version on a 300 win mag
it worked GREAT. brought recoil to .308 level
that said, not what I'd hang off an AR15 at all
I'm not a fan of brakes at all for defensive usage. If used indoors, the concussion off the walls sucks. A2, A2X, other flash hider device for supressors etc.
If used for comp/outdoors only, they are AWESOME!
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