B5 Systems Sierra K Receiver Extension Wolf Grey

B5 Systems Sierra K Extension Features Molded from high-strength polymer the Sierra K Receiver Extension is both durable and weight-efficient featuring internal structural reinforcement for stability. The integrated design reduces profile bulk and snag potential making it well-suited for PDW-style or low-visibility applications. The Wolf Gray coloration pairs perfectly with other gray-tone B5 accessories offering both aesthetic cohesion and rugged field performance. B5 Systems Sierra K Receiver Extension Specifications Manufacturer: B5 Systems Model: Sierra K Receiver Extension Fit: B5 Systems Sierra Stock Color: Wolf Gray Material: High-strength polymer Type: Fixed stock/receiver extension hybrid Design: Lightweight low-profile construction Application: AR-15 rifles and pistols configured for Sierra K compatibility