The BT paintball gun bipod adapter is required to mount the BT bipod to any barrels other than the BT M-16 or BT M-16 APEX™ paintball barrels. Installation and removal is simple and quick. When mated to the BT Barrel Bipod, you will have a stable platform to lay down suppressive fire. Mount the adapter, bipod and a CAR stock onto the ERC marker from BT and you can hold any defensive position by yourself.