The DoubleThreat Dual Position Dove Choke quickly adjust for long-range passing shots or close-range decoy shots. A simple twist and click design allows for a quick change between Pass and Decoy constrictions. For use with dove and field loads (#6-#8). Includes spanner wrench. This choke is compatible with the following Winchester Winchoke 1200/1300/1400; Browning Invector Series; Charles Daly O/U; H&R (excluding Excell automatic); Ithaca; Maverick Arms 88; Mossberg 500,535,9200,930; New England Firearms; SKB; Stoeger Coach,Condor,Uplander; Weatherby Mossberg Pro-Factor PF1.