It mounts to the face of the ARCA Swiss interface via two 10-32 screws and provides a sling stud to be used for Harris type bipods.
Before ordering, verify that your Front Plug is fitted with two 10-32 tapped holes on its ARCA Swiss Rail side. These threaded holes are needed to receive the Harris bipod adapter. If your Front Plug is not fitted with 10-32 tapped holes, you could buy Gen2 Front Plugs Kits by following any of these links:
BipodeXt II models Gen2 Front Plug Kit(fits both TACs and ARCs)
BipodeXt III models (fits both TACs and ARCs)