Primos® Dead-Dog™ predator choke tubes are crafted with the most demanding predator hunters in mind. Designed to increase the patter density of HEVI•SHOT® Dead Coyote™, copperplated lead, or regular lead shot for maximum knock down power. The Dead-Dog™ choke is ported to release gases so they don't blow through your shot pattern. It also helps reduce felt recoil of heavy loads. The Dead-Dog™ is effective at 50 yards or more. 12 ga.