Carlsons Winchester-Mossberg Choke Tube Modified 20 ga. Made in USA;Lifetime Warranty;Made from 17-4 heat treated stainless steel;Steel, Lead, and Hevi-Shot may be used through these chokes;Flush Mount;Available in 12ga, 20ga.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 7600 Product Group Code: 7600K Product Sub Group 1: 7600K1 Inactive: No Prop65 Applies: No Prop65 Cancer Harm: No