Dead Air Suppressor Adapter HUB Socket Silencer to P-Series Adapter Converts HUB-equipped silencers to accept P-Series adapters;Compatible with Dead Air Primal and other HUB silencers;1.375-24 outside threads for HUB silencers;1.203-28 inside threads for P-Series accessories;Supports booster assemblies, 3-lug mounts, and fixed mounts;Made from 4140 HT alloy steel for durability;QPQ black nitride finish for corrosion resistance;Overall length: 0.545 inches;Weight: 0.88 oz;Designed for use with most rifle and pistol caliberstable.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