Dead Air Mojave Piston 40 Cal. 9/16-24 Compatible with Mojave 9 and Mojave 45 suppressors;Designed for tilting-barrel handguns;Works with PB500 Booster Assembly and booster spring;Caliber: .40;Thread pattern: 9/16-24table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 7600 Product Group Code: 7600P Inactive: No Prop65 Applies: Yes Prop65 Cancer Harm: Yes Prop65 Chemical: Lead