Looks like it may be home made...?
This is a discussion on What is this... within the Misc. forums, part of the Sniping Related category; What is the name of the bipod brace and where can I find one?...
What is the name of the bipod brace and where can
I find one?
I've seen one at a range here a guy made that looked similar. He used a large cutting board and hot glued a wrist support for a keyboard.
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Hum, not sure what the use is for it unless it is attached to the shooting mat. Typically you will want something like that if you are going to pre-load the bipod by pressing it forward against that brace...but it looks like it would just slide forward. Some shooting mats have a canvas strap attached to it that you can hook your bipod feet into so you can push forward and preload the bipod