Patternmaster Standard Choke Tube 

The standard choke tube by Patternmaster was developed to use all shot, by its unique internal system that utilizes a stud system 3/4 of an inch from the muzzle end of the choke. The choke tube has a shot cup base which is delayed by the stud system for a fraction of a moment allowing the shot to proceed from the choke undisturbed by the shot cup or its gases. At the moment of the shot cup stopping at the studs, the open end is still in the choke, allowing the shot to remain at its tightest grouping when leaving the choke tube. Therefore, flying truer and longer before spreading.