First Strike T15 Prime Paintball MarkerFirst Strike T15 Prime Paintball Marker The First Strike T15 Prime is a magazine fed paintball marker offering a true . 68 caliber 1 to 1 AR rifle platform. The First Strike T15 Prime features a rugged lightweight aluminum body that will withstand the harshest conditions while maintaining optimum maneuverability. Equipped to use the two included 20 round V2 continuous feed magazines or you can switch to a standard hopper using an adapter sold