I just bought a rifle with an arca rail on the bottom, but I don't have an arca bipod. So, I pieced one together. I bought an arca quick-detach for $13.60, took the sling-stud attachment out of my regular bipod, and used a 1/4-20 bolt and washer to attach the arca quick-detach to the bipod. I made a short youtube video showing what I did, but I can't remember if we are allowed to post video links here.