BCM Forged Upper Receiver Assembly, AR/M4


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One of the go-to uppers for a quality build

(2 customer reviews)

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BCM Forged Upper Receiver Assembly, AR/M4

Built to the correct military specifications

(Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle. Please use a heat gun or hair dryer to warm up threaded bore of receiver if barrel extension is too tight.)


  • Precision machined to correct Mil-Specs from 7075 T6 Forgings extension, providing the user with superior strength when dropped or when mortaring malfunction clearance drills.
  • Fully Assembled with forward assist, and ejection port cover
  • Mil-Std 1913 Rail for mounting optics and accessories
  • Machined for use with barrels that use an M4 barrel extension
  • Laser etched T-markings for addressing the remounting of optics
  • Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
  • Hard Coat Anodized per Mil-A-8625F, Type III, Class2
  • Dry Film Lube on interior bore per Mil-Specs
  • As with all BCM® products, Made in the U.S.A.

2 reviews for BCM Forged Upper Receiver Assembly, AR/M4

  1. Hugh Evans (verified owner)

    Great upper, awesome service from rooftop as usual

  2. Hugh Evans

    Great upper, uses thermo fit, paired well with a Bcm lower and always great Bcm quality

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