UTG Pro Model 4/15 6-Position Extension Buffer Tube (Mil-Spec). Receiver Extension Tube with Mil-spec Diameter for AR15 Rifles and Precision Machined from 6061/T6 Aircraft Grade Aluminum.
• 6-position Receiver Extension Tube with Commercial-spec Diameter for AR15 Rifles
• Precision Machined from 6061/T6 Aircraft Grade Aluminum
• Matte Black Anodizing with Type III Class II Hard Coat for Best Wear Resistance
• Tightest Tolerance Control for Zero-gap Fit with Polymer Stock and Receiver to Meet Most Demanding Silent Operations
• 100% Proudly Made in USA for Most Serious Users