As this was sent specifically to 357Mag in response to an older post which has mysteriously dissolved into the ether I've offered no description. The image is quite dense though, blow it up to fill your screen with the brake to see the design. Note that the stock is quite large, not evident in the pic. It's for a 50BMG, LOP is 14" and that ventilated hunk is a piece of 1.5X3" 'C'-channel