The Arca Swiss rail allows for easy and fast adjustments. This 3 in 1 rail has a screw hole for your common camera tripod adapter. It has the Arca Swiss rail which allows you to easily slide your gun back and forth. If you have a picatinny bipod, there's also a picatinny rail in the front. It comes with an extended dust cap for your convenience. Overall, it's a well versed rail for the FX Impact.