CMMG Barrel Sub-Assembly 300 Blackout 16.10" Black Nitride Finish 4140 Chromoly Steel Material Carbine Length with Medium Taper Profile for AR-15 30D120A

Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced.

• Chambered in .300 Blackout
• 16.1” Barrel Length
• Medium Taper Contour
• Carbine Gas System Length
• 5/8-24 Threads
• 1-7 Barrel Twist
• Available in a Bead Blasted Stainless Steel or Salt Bath Nitride Finish