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Bravo Company MFG

BCM M4 Upper Receiver Assembly

BCM M4 Upper Receiver Assembly
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Availability: Out of stock




Build to the correct Mil-Specs.
(Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle.)


  • Precision machined to correct Mil-Specs from 7075 T6 Forgings
  • 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
  • Made in the U.S.A.

This product will not include the BCM logo etched on the receiver. It is marked BCM over the gas tube hole.

Additional Info

Additional Info

Manufacturer Bravo Company MFG
Finish Black
Barrel Length No
Caliber No
Configuration No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No


Customer Reviews (7)

No commentReview by
Great upper (Posted on 2/15/2017)
Well BuiltReview by
Well built and like it says you need to heat up to fit the barrel in. (Posted on 2/15/2017)
No commentReview by
- (Posted on 7/28/2016)
No commentReview by
- (Posted on 6/1/2016)
No commentReview by
- (Posted on 5/25/2016)
TightReview by
Had a barrel that was a little wobbly in a couple uppers that I had, so I took a chance on this BCM in hopes of tightening things up. It is as advertised. If I hadn't heated it up, there was no way the barrel was going in without pounding on it. I applied heat from a hair drier to the front of the receiver, and I had left the barrel out in the 40deg cold for a few hours. It was still tight, but went together perfectly. Anodizing was a little off, but a coat of Break Free and it looks fine. I've been building AR's professionally for years, and will be using these on precision builds going forward. (Posted on 3/16/2016)
Not up to snuffReview by
I'm sure the upper I received was functionally perfect, but this one did not meet fit or finish standards for BCM. The barrel extension did not fit tight, or even snug as stated in the description and this was with a BCM barrel and two other manufacturers parts.
The finish is what I would expect from a blem box.

None of this is any fault of Rainiers, but again not what I expected from BCM.
(Posted on 2/1/2015)

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