Perfect for building your custom MK3 upper group. Comes with properly installed barrel extension. All barrel sub-assemblies are properly headspaced.

• 18?
• Heavy Taper Profile
• 416 Stainless Steel
• Bead Blasted Finish
• 1:10 Twist
• 308 WIN Chamber
• Threaded 5/8-24
• Rifle Length Gas Port
• .936? Gas Journal