This Accu-Tac Arca-Swiss Mount QD adapter allows Accu-Tac bipods to be mounted directly onto Arca Swiss rails. The quick-release lever can be opened halfway to allow the bipod to slide over the rail. Pull it all the way out to quickly remove the bipod.
This is handy if you already have a G2 bipod for Picatinny and don't want to buy a new bipod with an Arca lock.