BCM 18″ 5.56 NATO 1:8 Stainless Steel Barreled Upper – 15″ KeyMod KMR Alpha Rail


  • 18” hand lapped 410 stainless steel Govt. profile 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 KMR ALPHA KeyMod Free Float Handguard
  • (1) 3” Picatinny rail section
  • (1) BCM KeyMod sling mount


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SKUBCM-URG-18-SS410-KMR-A-15 Category

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

This amazing product is built around a cold hammer forged 41V50 chrome moly vanadium steel barrel, meaning that it will be incredibly accurate and long lasting. The cold hammer forging process also produces barrels with a more consistent chamber and bore, making this an ideal choice for any serious marksman.

In addition to its outstanding barrel, the BCM 18″ 5.56 NATO 1:8 Stainless Steel Barreled Upper also features the BCM KMR ALPHA Handguards. These handguards are constructed from 100% aluminum and hardcoat anodized for an anti-reflective, corrosion resistant finish. KeyMod mounting slots on seven sides provide ample space for attaching all your favorite accessories, while a continuous Picatinny rail ensures that you’ll always have a stable platform for your optics.


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