BCM® M4 Upper Receiver Assembly (w/ Laser T-Markings)

MSRP: $149.00
Your Price: $129.00
(You save $20.00 )
Maximum Purchase:
5 units
Stock Status:


Professional Grade Weaponry

BCM® M4 Upper Receiver Assembly (w/ Laser T-Markings)

Built to the correct Mil-Specs
(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.

***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit www.p65warnings.ca.gov.***

139 Reviews

  • 5
    Solid upper

    As expected, solid part

  • 5
    First AR Build

    I really like the looks of the BCM upper Assembly. Looking forward to getting my rifle all put together. Thanks BCM for your commitment to quality parts!!

  • 5
    Customer review

    nice snug fit with the barrel

  • 5
    Customer review

    Review body is empty

  • 5
    Customer review

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  • 5
    Quality craftsmanship

    If you want to build an AR with quality parts shop here. Competitive pricing on high quality merchandice

  • 3
    Bcm upper

    3 stars, upper lines did not matchup once again slightly off. The finish was fantastic ! The fit...a little loose.

  • 5
    Fit and Finish

    Top Notch. Keep making quality products BCM.

  • 5
    Buy BCM

    If you’re thinking about buying BCM anything. Don’t think anymore. Just buy it. I have never been disappointed.