BCM 18″ 5.56 NATO 1:8 Stainless Steel Barreled AR-15 Upper – 15″ M-LOK MCMR Rail


  • 18” SS410 stainless steel barrel
  • Chambered in 5.56 NATO with 1:8 twist rate
  • 1/2×28 A2 Flash Hider
  • High pressure tested and magnetic particle inspected
  • M4 feed ramps
  • T-Marked Picatinny rail
  • 15” BCM MCMR M-LOK Free Float Handguard


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SKUBCM-URG-18-SS410-MCMR-15 Category

NOTE: Does not include a bolt carrier group or charging handle.

Looking for a top-of-the-line barreled upper receiver? Look no further than BCM’s 18″ 5.56 NATO 1:8 Stainless Steel Barreled AR-15 Upper. This professional grade weapon is built around a hand lapped, button rifled, MIL-SPEC SS410 stainless steel barrel that is more corrosion resistant than conventional 416 stainless steel barrels. The BCM MCMR Handguard eliminates external load on the barrel, reducing deflection for more accurate shooting. M-LOK mounting slots and a continuous Picatinny rail provide all the space you need for your favorite accessories. Don’t settle for anything less than the best – trust BCM for all your barreled upper needs.


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