The Leapers UTG Pro Commercial Spec 6-Position Receiver Extension Tube is a fine example of high-quality production right here in the USA. This extension tube is machined to commercial-spec diameter for use with AR-15 style rifles.If you are looking for a top-quality receiver extension tube for your AR-15 weapon look no further than the Leapers UTG Pro Commercial Spec 6-Position Receiver Extension Tube. Crafted using 6061 T6 aircraft-grade aluminum this extension tube is guaranteed to deliver years of durability and dependable performance all without weighing you down. It also comes in an attractive black matte hard-anodized finish. 6-position Commercial-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 Black Type III Class II Hard Coat Anodize Proudly Designed and Made in USA