Bravo Company Manufacturing M4 Upper Receiver Assembly

Receiver is a bit undersized but BCM did that on purpose. I borrowed the wife’s hair dryer to heat up the aluminum a little and my barrel slid right in with no issues.
<br>I will definitely be buying more of these for my future builds.

This receiver is undersized on purpose. STOP beating your barrel and or receiver with a mallet. It requires thermal fitting which means you need to heat up the receiver end with a heat gun or hair dryer first to allow the aluminum to expand and then set the barrel in with a little grease on the barrel extension. Then tighten the barrel nut while its still warm. When it cools it will be a nice tight fit.

Great fit, but finish leaves some to be desired. Didnt realise it was an unmarked upper so a little disappointed there aswell. Other than those two minor gripes i have it is well worth the money. Finish is like a flat black matte finish almost like charcoal.

Bought this reciever because it was undersized and BCM quality. Initially my Lothar Walther S/S would not even start to fit. I used a Brownell's lapping bar with valve polishing compound on the receiver face and insde the reciever where the barrel extension mates. Turn the lapping bar by hand go slowly and check the bbl extension fit often . You will get a perfectly square and snug bbl installation without having to use a hammer or excessive force. This product will be my go to reciever for future builds. Tks!

I used this with two different barres to test and really like it . The fit of the barrel into the receiver was very good and upper worked well with two different lowers.

Excellent fit & finish and fast shipping

The bcm upper I received is all that I expected it to be under visual inspection. The t marks are laser etched without depth. I mention this as a colt le6920 user to others of the like..my colts have had t marks etched and cut to depth engraved may be the word..either way just cosmetic..comparable to colt in quality however but many companies stripped receivers are.

I just received and assembled my BCM upper, with an 18" SS spiral fluted barrel. The barrel squeezed in, with a little finesse, up to the notch. Once there, I used a rubber mallet to tap it home. All it took was 2-3 light taps, and they seem well mated and supported. I haven't put my hand guard by Diamondhead on yet, but, the barrel is not slipping out. The finish, on the receiver, is a deep charcoal black. Very rich looking, with absolutely no flaws! It was very light, in weight. So much so, that I had to make sure it wasn't polymer. I am very impressed with the build quality, on this unmarked BCM upper. I would rate this higher than the build quality, of either my Stag or Colt. You can feel confident that you are getting the very best your money can buy.

First off, shipping and customer service is beyond anything I've ever seen. But on to the point of the review.I did give it 5 stars because the product is awesome. As stated it is barely undersized and made for a nice tight grip on the barrel. Used a rubber mallet and block to ease her into place. Definitely only get this receiver if you plan for your barrel to die with this receiver.Fits absolutely perfect with my Colt M4 bottom receiver EXCEPT for the texture of black. Got it together and it nearly matched. Took it for a test run and did my first cleaning and then it stuck out like a soar thumb. I'm hoping it's just new finish and will eventually calm down. But it's merely a personal cosmetic appearance issue so it gets 5 stars and a good review. But definitely be aware it's a different kind of finish black. I'll include picture if I can.http://s13.postimg.org/omuna326f/Snip_AR.jpg

Fast shipment as always from Primary Arms.I tried to slide in a Spike Tactical 'Optium' barrel into this receiver. Nope, way too tight. I sprayed WD40 on the barrel extension and then convinced it using a rubber mallet with pretty heavy blows. Once it was in, there was no play whatsoever. It felt like the barrel is welded to the receiver. This should really improve accuracy. One star off for the finish. The finish appears botchy and not uneven.

Great price, great product, what more can I say?