I installed with a arca+picatinny head, it is perfect

Excellent product. Machined to perfection. Fit the Area 419 Dual clamp perfect.

This works great, as long as it's on a bipod where the clamp sits higher than the legs/arch. However on bipods like the WB, LP, HD series, it doesn't work well because the lever can't come forward far enough without hitting the brace/legs. On a clamp like the Area 419/RRS etc. you need to be able to rotate the lever 180 degrees, but the lever only makes it a bit past 90 before running into the legs/arch. On AccuTac's clamps they get around this by having the clamp go from fully open to tight in just 90 degrees.

There are still some ways to make it work, but it's more hassle. You can tilt the clamp all the way to the left/right to get the lever over the legs/arch, but it kind of makes getting the bipod on/off a hassle. You can also just live with only being able to get the lever open 90 degrees, which allows you to slide the bipod onto the rail from the front, which works on some setups, but isn't ideal to not be able to open the clamp fully so you can just remove it from any location on the rail. It also takes away the ability to adjust the clamp tension without removing the bipod entirely from the rail (which is often needed if you move from Arca to Picatinny).

So it technically fits, and you can make it work, but it significantly limits the functionality of the 419/RRS clamps when used with the WB/LP/HD series bipods as compared to bipods where the clamp sits much higher.

I used this to convert my bipod to an ARCA Lock setup. Works great!

Just what I've been waiting for on my bipod.