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Thread: First Look at BCM's NEW M4 Upper Receiver

  1. #81
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    Quote Originally Posted by C4IGrant View Post
    Cool. Let us know how you like it.




    C4
    Will do!

    Thanks for shipping it out fast.

  2. #82
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    Sep 2009
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    Just received my 2 this am!

    WOW! These are NICE!! NO LESS THAN PERFECT!

    While I haven't started building with it yet, just measuring/inspecting and comparing it to other "mil-spec" uppers is enough to tell me I'm going to be seriously pleased with it once I get the rifle built! Grant's pic are better than mine would be so I'm not going to attempt that.

    The whole thing just oozes perfection and attention to detail! Everything is addressed and done well! I'll report back when I start building with it but that may be a while!

    Grant, I'm surprised you're not out of them already! Oh, and thanks for ATF advice as well!

    Guys, don't buy any other upper...it'll be a waste!

    Sparky
    "An opinion solicited does not equal one freely voiced," Al Swearengen, Deadwood 1877.

  3. #83
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    Mine were delayed by UPS due to "adverse weather conditions". Should be here today.

  4. #84
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    Not to take business away from grant, but in case they run out Red State Tactical also has these available with many shipping options. Another good dealer worth supporting.

  5. #85
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    Mine is still on the UPS truck. The driver better hurry up and get here. He and I are friends and hunt together so he kind of looks out for me.

    He just dropped it off! Looks great and can't wait till lunch to head home and throw it on top of a Noveske Lower I finished a couple of weeks ago.
    Last edited by Watrdawg; 02-07-14 at 12:12.
    ____________________________________
    Duck Tape can't fix stupid but it sure muffles the sound!

  6. #86
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    Got mine today. They were a nice fit on a new BCM lower that I picked up today as well. Pins easily pushed in, but there was minimal play between the upper and lower. Basically perfect. I also test fit them to a new BCM BFH barrel. The fit to the extension could best be described as precise. Slightly tight, but slid 95% of the way on by hand. A light tap with a hammer seated it. Once the barrel was seated, it was nice and snug, with zero play. So far, I'd say it is exactly as advertised. I'm looking forward to building a couple of uppers with these.

    As a side note, the new lower was an exact fit on a Vltor MUR upper. Pins pushed in without tools, but needed exact alignment. Once together, the upper and lower were bank vault tight with zero play. In both cases, the upper and lower are a good testament to the quality of BCM products. Now, if I could just get those KMR rails I've been patiently waiting for, I'd be set.
    Last edited by mtdawg169; 02-08-14 at 08:35.

  7. #87
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    Quote Originally Posted by mtdawg169 View Post
    Got mine today. They were a nice fit on a new BCM lower that I picked up today as well. Pins easily pushed in, but there was minimal play between the upper and lower. Basically perfect. I also test fit them to a new BCM BFH barrel. The fit to the extension could best be described as precise. Slightly tight, but slid 95% of the way on by hand. A light tap with a hammer seated it. Once the barrel was seated, it was nice and snug, with zero play. So far, I'd say it is exactly as advertised. I'm looking forward to building a couple of uppers with these.

    As a side note, the new lower was an exact fit on a Vltor MUR upper. Pins pushed in without tools, but needed exact alignment. Once together, the upper and lower were bank vault tight with zero play. In both cases, the upper and lower are a good testament to the quality of BCM products. Now, if I could just get those KMR rails I've been patiently waiting for, I'd be set.
    As a long time VLTOR MUR user, I think the need for them is over IMHO.



    C4

  8. #88
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    Quote Originally Posted by C4IGrant View Post
    As a long time VLTOR MUR user, I think the need for them is over IMHO.



    C4
    I think you may be right. The one I mentioned above was a complete upper that I've had a couple of years. The BCM uppers were perfect in fit to the lower and the barrel extension fit was extremely precise.

  9. #89
    Join Date
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    How do the feed ramps line up with your barrel extension? I swapped a barrel over to my new BCM4 upper last night and I concur that the barrel fit is phenomenal. There is also minimal play between the upper and lower. My only 'complaint' is that the M4 feedramp cuts in the upper aren't quite flush with the ramps in the barrel extension. It doesn't look like they're not cut deep enough into the upper; rather it's almost like the barrel doesn't insert far enough into the upper. There's maybe 0.030" of 'shelf' in the transition from receiver ramps to barrel extension ramps. I'm sure it won't cause any issues - certainly better than having the barrel go in too far and having a lip where the bullet tip would get caught.

    Quote Originally Posted by mtdawg169 View Post
    Got mine today. They were a nice fit on a new BCM lower that I picked up today as well. Pins easily pushed in, but there was minimal play between the upper and lower. Basically perfect. I also test fit them to a new BCM BFH barrel. The fit to the extension could best be described as precise. Slightly tight, but slid 95% of the way on by hand. A light tap with a hammer seated it. Once the barrel was seated, it was nice and snug, with zero play. So far, I'd say it is exactly as advertised. I'm looking forward to building a couple of uppers with these.

    As a side note, the new lower was an exact fit on a Vltor MUR upper. Pins pushed in without tools, but needed exact alignment. Once together, the upper and lower were bank vault tight with zero play. In both cases, the upper and lower are a good testament to the quality of BCM products. Now, if I could just get those KMR rails I've been patiently waiting for, I'd be set.
    B.A.S. Mechanical Engineering Technology

  10. #90
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    Quote Originally Posted by Eric D. View Post
    How do the feed ramps line up with your barrel extension? I swapped a barrel over to my new BCM4 upper last night and I concur that the barrel fit is phenomenal. There is also minimal play between the upper and lower. My only 'complaint' is that the M4 feedramp cuts in the upper aren't quite flush with the ramps in the barrel extension. It doesn't look like they're not cut deep enough into the upper; rather it's almost like the barrel doesn't insert far enough into the upper. There's maybe 0.030" of 'shelf' in the transition from receiver ramps to barrel extension ramps. I'm sure it won't cause any issues - certainly better than having the barrel go in too far and having a lip where the bullet tip would get caught.
    Perfect fit from the barrels I have tested. Assuming your are using a BCM barrel, are you sure you inserted it all the way??



    C4

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