The Area 419 ARCALOCK Arca Barricade Stop is an additional stop for your ARCALOCK system. The bolt pattern is the same as Atlas Bipods and can be sandwiched between the clamp and bipod. It can also be run as a stand alone on a clamp with included hardware. The teeth on the front dig into the barricade for ultimate grip. NoteDoes not work in conjunction with Harris Bipod without the use of Are 419's Spigot Extension