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

MSRP: $149.00
Your Price: $119.00
(You save $30.00 )
(103 reviews) Write a Review
Maximum Purchase:
5 units
Stock Status:

Out of stock


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.***

103 Reviews

Write a Review
  • 5
    First AR Build

    Posted by K Trine on May 8th 2019

    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

    Posted by bryan r on May 8th 2019

    nice snug fit with the barrel

  • 5
    Customer review

    Posted by Adam on May 8th 2019

    Review body is empty

  • 5
    Quality craftsmanship

    Posted by Richard D. on Apr 20th 2019

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

  • 5
    Fit and Finish

    Posted by Reload It on Apr 10th 2019

    Top Notch. Keep making quality products BCM.

  • 5
    Buy BCM

    Posted by Austin Embry on Apr 10th 2019

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

  • 5

    Posted by anonymous on Apr 10th 2019

    Perfect as advertised.

  • 5
    Quality Products/ Fast Shipping

    Posted by John Shearon on Apr 10th 2019

    BCM continues to maintain a high standard when delivering quality products as well as responsive to customer needs with fast shipping, I had recently ordered a BCM upper reciever. The care taken to package the reciever was impressive. It was sealed in a protective plastic wrap to include an appropriate sized boxed to prevent unnecessary movement during shipping. My upper reciever was on my doorstep the next day just using USPS priority mail.

  • 5
    Stripped upper

    Posted by jonguyen on Apr 10th 2019

    Excellent service. Thank you BCM.
    Fast shipping and stripped upper receiver is very clean and looks great