Mil-spec 6-position Extension Tube Bronze Description UTG PRO Mil-spec 6-position Extension Tube Bronze Features: - 6-position Mil-spec Diameter Receiver Extension Tube for AR15 Rifles - Extension Tube CNC Machined from 6061-T6 Aircraft Grade Aluminum with Precisely Rolled Threads for Durable Thread Engagement with Lower Receiver - Underwent the Tightest Tolerance Controls for a Secure Fit and Function with Various Collapsible Stocks - Finished in a Matte Bronze Type III Class II Hard Coat Anodize - Proudly Designed and Made in USA Specifications: - Material: Aluminum - Height: 1.45 - Length: 7.25 - Weight: 4.0 oz - Color: Bronze