Abstract: An apparatus for use with a shotgun that includes an assembly having an interchangeable choke and compensator, and a lock nut for securing the compensator in a selected alignment with the choke. The current invention allows for shotguns, chokes, and compensators to be used interchangeably while still maintaining the correct positioning of each part relative to the others.

Abstract: A two piece ejection system for a shotgun includes a chamber portion having a first, second and third section of varying outside diameters and an extractor formed from a hollow cylindrical tube having a first and second end, the second end including a plurality of slots. The slots are configured to allow the extractor to slide over the circumference of the third section of the chamber portion and be in sliding engagement with the second section of the chamber portion. Interference means on the plurality of slots and the sections of the chamber portion restrict the travel of the extractor over the second section of the chamber portion.