Quick view UTG UTG PRO AR10 308 6-POSITION MIL-SPEC BUFFER TUBE (BLACK ANODIZED) • 6-position Mil-spec Diameter Receiver Extension Tube for AR308 Rifles• Extension Tube CNC Machined from 6061-T6 Aircraft Grade Aluminum with Precisely Rolled Threads for Durable Thread Engagement with Lower Receiver• Underwent the... Now: $24.95 Was: MSRP: Add to Cart Compare