Dead Air Wolverine Collar Collar for M13,M14,M15,M16 Inserts Compatible with Wolverine thread inserts in M13, M14, M15, and M16 sizes;M14 collar included with the Wolverine Silencer;Additional collars available for M24 and M26 thread inserts;Designed for use with Dead Air Wolverine suppressors;Provides a secure fit and precision alignment;Enhances compatibility with various threaded firearms;Built for durability and long-lasting performancetable.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