UTG PRO AR15 6-position Receiver Extension Tube Mil-spec

• 6-position extension tube with Mil-Spec diameter for AR15 rifles
• CNC-milled extension tube made from 6061-T6 aircraft aluminum with a precise thread for permanent thread engagement
• strictest tolerance controls for a secure fit and a secure function test
• anodized in a matt black type III class II hard lacquer
• designed and made in the USA