The Kicks Gobblin' Thunder Choke tube is designed for use with Accu-Mag and Mossberg 835/935 shotguns. The purpose of this choke is to extend the length of the shotgun with out throwing lead down range. This choke is said to be optimized for use with lead shot. The main issue with lead shot in choke tubes is that the constrictions of the shape force the lead to flow sideways… causing kick-back. The solution to this is to make the choke longer and make throwing lead shot easier. Helicodynamics have also been said to be much more efficient than a purely concentric choke tube. The added length of the shotgun choke tube allows the shooter to throw significantly more lead shot down range. Also helps to prevent lead from escaping during the shot.