Empire BT Combat BlackThe BT 4 Combat is the marker that started the BT series. It's the perfect scenario or woods ball marker which allows you to build the ultimate machine. Fully upgradeable, the BT Combat is the scenario marker by with others are judged. This reliable and accurate marker is the obvious choice for use in your scenario or woods ball event. The front grip is removable and the military standard dual pica tinny rails accept many tactical upgrades. If you are