Cmmg Bbl 300blk 8" 4140cm Sbn

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

Features :

• "8.0";"Medium Taper Profile"
• 4140 Chrome Moly
• Salt Bath Nitride Finish inside and out
• 1:7 Twist
• 300 AAC Blackout Chamber
• Threaded 5/8-24
• Pistol length gas port
• .750 Gas Journal