Carlson’s Sporting Clay Modified Flush Choke Tube for .410 ga Browning Inv/Moss 500 .401 SPECIFICATIONS BRAND: CARLSON'S BRAND FAMILY: SPORTING CLAYS CA PROP 65: YES CA PROP 65 CHEMICAL: VINYL CHLORIDE CHOKE DIAMETER: .401 COLOR: SILVER GAUGE: 410 GA WEAPON MFG: BROWNING DESCRIPTION Lead shot, Steel Shot, Copperplated Shot, Nickel Shot, Hevi-Shotshells, and Buck Shot can be used in our Sporting Clay Choke Tubes. Steel shot larger than BB should not be used in any Sporting Clays Choke Tube tighter than Full Constriction. Our Sporting Clays Choke Tubes will throw tighter/denser patterns than Flush Mount Choke Tubes due to a longer parallel section