B5 Systems Sierra K Extension Kit

B5 Systems Sierra K Extension Kit Features Constructed from reinforced high-strength polymer the Sierra K extension is durable yet lightweight with an internal rib structure for added rigidity. The fixed length and slim profile help reduce snag hazards and weight while maintaining a secure shoulder weld for stable shooting. Finished in classic matte black this kit delivers a clean tactical look and pairs seamlessly with other B5 Systems components like the P-Grip and handguards. B5 Systems