While Winchester claimed a patent on such a choke, Savage's "Skeet Cylinder" and "Quarter Choke" they used in their A.H. Fox Skeet & Upland Game Guns measures pretty much the same as WS1 and WS2. Similarly Remington Arms Co., Inc.'s "SKEET" choke they used on their Models 31 & 32 and the "Sportsman" Skeet Guns, and an optional boring on other guns, was the same as WS1.
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