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• 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 Black Type III Class II Hard Coat Anodize

• Includes Mil-spec 6-position Extension Tube, Recoil Buffer, Buffer Spring, Receiver End Plate, and Castle Nut

• Proudly Designed and Made in USA