I've got my three and I should be able to give mine a try this weekend in my VP9 and P30. They're a one-piece design and the spacer seems to lock into the floorplate. The spacer appears to be no wider than the OEM floorplate, so if a magwell is compatible with the OEM floorplates I would assume it will fit the magwell (I don't have one to check). I used my IOP credit to buy a few more just for grins.