B5 Systems Sierra K Stock, Coyote Brown - SRK-1657

B5 Systems Sierra K Extension Features This receiver extension is constructed from high-strength aluminum offering a robust and lightweight platform for AR-15 rifles or pistols using the Sierra K stock. The Coyote exterior finish is durable non-reflective and built to withstand field abuse without adding unnecessary bulk. With tight manufacturing tolerances and mission-ready durability the Sierra K extension is ideal for shooters building minimalist high-performance AR configurations. B5 Systems Sierra K Receiver Extension Specifications Manufacturer: B5 Systems Model: Sierra K Receiver Extension Fit: B5 Systems Sierra Stock Color: Coyote Material: High-strength aluminum Finish: Coyote-coated (non-anodized) Application: AR-15 rifles and pistols configured for Sierra K stock compatibility