BCM 5.56 NATO Mid-Length Lightweight Fluted Barreled AR-15 Upper – MCMR-13 – 16″


  • 5.56 NATO chamber
  • 16″ Mil-B-11595E steel barrel
  • Enhanced lightweight fluted barrel
  • Manganese phosphate barrel finish
  • M4 feed ramp barrel extension
  • T-marked upper receiver
  • USGI 1:7 twist rate
  • Chrome bore and chamber
  • 3″ Picatinny rail section
  • BCM MCMR sling mount


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The BCM 5.56 NATO Mid-Length Lightweight Fluted Barreled AR-15 Upper is the perfect choice for those looking for an upgrade to their current setup. This upper features a 16″ enhanced fluted barrel made from Mil-Spec steel material, which significantly increases the barrel’s life and performance. A strong manganese phosphate finish creates a porous surface on the entire barrel to help protect against corrosion, while the USGI twist rate of 1/7 is versatile and offers compatibility with heavier 5.56 ammo for superior ballistics.

This mid-length 5.56 standard barreled upper also offers a T-Marked upper receiver built around the concept of modularity to aid in remounting tactical accessories specific to the mission at hand. The barrel extension and upper receiver have a USGI modification that makes the feed ramp longer and steeper for increased reliable feeding. These factory machined M4 feed ramps are Mil-Spec and will work with any bolt carrier group configured for proper feeding. An included charging handle rounds out this precision-crafted package.


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