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For use with all Mossberg 20 Gauge 500, 505, 510 Mini, and Maverick 88 shotgun barrels that are threaded for chokes.
Also compatible with Smith & Wesson, Savage, & U.S. Repeating Arms (Win-choke) and Browning Invector interchangeable choke models.
Bore Diameter: 20 Gauge
Choke Constriction: Improved Cylinder