The conversion Kit comes with three auto centering muzzle anchors in 12, 16 and 20 gauge, three chamber length regulation rings and three screwable cartridge bases for easy interchange between the three shotgun bores.The brass sliding breech acts as a feeder / extractor for the .22 LR ammo, and holds the adaptor pin that converts the system from center fire to rim fire. The 13 inches .22 barrel fits inside the shotgun barrel, and is loaded as a normal shot shell.The muzzle anchor has four screws for easy alignment and a shock absorber that eliminates muzzle vibrations when shooting

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