Barrel Subassm 16.1in MT 4140CM SBN 5.56

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

Description:

• 16.1″ 
• Medium Taper Profile
• 4140 Chrome Moly
• Salt Bath Nitride Finish inside and out
• 1:7 Twist
• 5.56×45 NATO Chamber
• Threaded 1/2-28
• Midlength gas port
• .750″ Gas Journal