Dead Air KeyMicro Brake .38 Cal. 58-24 Single-port muzzle brake with a compact and lightweight design;Features a 9mm bore for versatile application;Compatible with KeyMicro and KeyMo adapters;Works with Wolfman (KeyMicro adapter), Ghost 45 (KeyMicro adapter), Sandman series, Nomad series (KeyMo adapter), Primal, Sierra 5, and Wolverine (HUB adapter);Made from durable 4140 HT alloy steel;Black nitride finish for superior corrosion resistance;Weight: 3.41 oz;Length: 2.063 inches;Offers precision braking and minimal added weight;Designed for seamless integration with Dead Air mounting systemstable.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