Used Saber Tactical FX Impact Arca Swiss Rail ST0007
The Arca Swiss rails allow for easy and fast adjustments. This 3 in 1 rail has a screw hole for your common camera tripod adapter. It also has the Arca Swiss rail which allows you to easily slide your gun back and forth. If you also 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.
This one was taken in on trade, lightly used as you can see from the pics.
See https://sabertacticalinc.com for installation video/instructions.