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Questions & Answers
Does this work with .300 BLK

Yes. as long as you put a 300blk barrel on it.

by Chris Conover, Verified Owner, October 11, 2021
Whats the difference between this product and this (812526022448) product? They both look like the same Expert Answer

This is a standard upper and the MK 2 has a few overall design changes to the body.

by Ben, Gear Expert, October 16, 2021
Customer Reviews
Helpful Positive Review
BCM UPPER Receiver. by Thomas, June 12, 2018
This works great and looks great as well, I got this on sale and could not be happier with the product! I was very happy with the fit and function. The extra coupons they sent in the box with it was a nice surprise also.
3/3 found this helpful
Helpful Positive Review
great start to a build by Phillip Leon, Verified Owner, May 5, 2024
This was a great piece, solid for my build. BCM has never let me down.
1/1 found this helpful
Helpful Positive Review
Grateful that these things exist by max, Verified Owner, June 25, 2024
Honestly I'm just happy that I can be able to buy one of these (very well made) things to start building out a new upper/set up. They do what they're supposed to, arrives very clean and to spec, no blemishes, and GTG.
1/1 found this helpful
Helpful Positive Review
Great upper by Bigtwin41st, Verified Owner, November 16, 2017
Bcm upper great fit matched with a spikes lower receiver. Very good company also look at their enhanced lower parts kit with pnt trigger. Anything bcm is top notch from barrels right down to their bcg.
5/5 found this helpful
Helpful Positive Review
Sweet BCM UPPER by Son of Slaughter LLC, July 8, 2018
I have purchased two of these uppers. One for a 5.56, 16in ar15 build, and the other for a 300blk 10.5in build. Both uppers have been top notch quality. They have both had a snug fit with the barrels (fn 16in, faxon 10.5). I had to heat both of them ...
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2/3 found this helpful
Helpful Positive Review
Great Upper by Robert, Verified Owner, November 24, 2019
I love the undersized extension. You will need to apply heat to seat your barrel in the receiver. I greased the barrel extension, applied heat to the receiver with a hair dryer, and the barrel slid right in. Definitely the most secure fit of any uppe...
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2/2 found this helpful
Read All 33 Reviews
Color: Black Finish: Black Hard Anodize Fabric/Material: 7075-T6 Aluminum Caliber: 5.56x45mm NATO Gun Model: AR-15 , M4 Condition: New

Code: BCM-UPR-BCM4-UR-M4-EE

MPN: BCM4-UR-M4

UPC: 855877004442

List: $149.00Save $9.01
$139.99

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Product Info for Bravo Company AR-15/M4 Complete Upper Receiver Assembly

The Bravo Company MFG AR 15/M4 Complete Upper Receiver Assembly is the perfect addition to your next AR 15 build. All AR15 Upper Receivers from Bravo Company are manufactured to correct Mil-Spec standards, so you can count on this to fit a wide variety of lower receivers and attachments with ease. The inside diameter for the barrel extension is slightly undersized to give it a tighter fit and make the rifle more accurate, ensuring you have the capabilities to hit your target. This complete upper receiver comes fully assembled with the forward assist and ejection port cover already installed, so pick one up today to complete your build.image

Note: if the barrel extension is too tight, use a heat gun or hair dryer to warm up the threaded bore of the receiver before installing.

Specifications for Bravo Company AR-15/M4 Complete Upper Receiver Assembly:

Manufacturer: Bravo Company MFG
Color: Black
Finish: Black Hard Anodize
Fabric/Material: 7075-T6 Aluminum
Caliber: 5.56x45mm NATO
Gun Model: M4, AR-15
Condition: New
Attachment Type: Picatinny

Features of Bravo Company MFG 4-UR-M4 Upper Assembly Flattop:

  • 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

Package Contents:

  • Bravo Company AR 15/M4 Complete Upper Receiver Assembly

Bravo Company AR-15/M4 Complete Upper Receiver Assembly Orderable Models

List of Orderable Models

  • Bravo Company AR-15/M4 Complete Upper Receiver Assembly, Flattop, Aluminum, Black, BCM4-UR-M4 , MPN: BCM4-UR-M4 , UPC: 855877004442 , Code: BCM-UPR-BCM4-UR-M4-EE

Bravo Company AR-15/M4 Complete Upper Receiver Assembly Unavailable & Discontinued Models

List of Unorderable Models

  • DEMO, Bravo Company AR-15/M4 Complete Upper Receiver Assembly, Flattop, Aluminum, Black, BCM4-UR-M4 , MPN: BCM4-UR-M4-DEMO , Code: BCM-UPR-BCM4-UR-M4-DEMO
  • USED Bravo Company AR-15/M4 Complete Upper Receiver Assembly, Flattop, Aluminum, Black, BCM4-UR-M4, EDEMO3, Condition Fair, Scratches , MPN: BCM4-UR-M4-EDEMO3 , Code: BCM-UPR-BCM4-UR-M4-EE-EDEMO-SC-D
  • USED, Bravo Company AR-15/M4 Complete Upper Receiver Assembly, Flattop, Aluminum, Black, BCM4-UR-M4 , MPN: BCM4-UR-M4-EDEMO , Code: BCM-UPR-BCM4-UR-M4-EE-EDEMO-US-D
  • USED Bravo Company AR-15/M4 Complete Upper Receiver Assembly, Flattop, Aluminum, Black, BCM4-UR-M4, EDEMO4, Used, Condition Like New , MPN: BCM4-UR-M4-EDEMO4 , Code: BCM-UPR-BCM4-UR-M4-EE-EDEMO4
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