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

  1. #251
    Join Date
    May 2006
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    Quote Originally Posted by luckydube56 View Post
    I am under no illusion that it was BCM at fault. I've bought their products from them (and from you) including complete rifles, uppers, lowers and misc parts for my own builds. Never had problems with any of them.
    We know. Just having some fun!



    C4

  2. #252
    Join Date
    Aug 2011
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    It probably would have just slid on if you would have hit the upper with a heat gun. I experienced a tight fit (as I expected and wanted) with my BCM4 upper and could only get the barrel started in the receiver. So I just hit the upper with a heat gun for a short period of time and then the barrel just slide right in with the Aeroshell 33ms grease. Ridiculous how easy it was. Why anyone resorts to sanding or freezing the barrel is beyond me.

  3. #253
    Join Date
    Dec 2012
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    Quote Originally Posted by titanse05 View Post
    It probably would have just slid on if you would have hit the upper with a heat gun. I experienced a tight fit (as I expected and wanted) with my BCM4 upper and could only get the barrel started in the receiver. So I just hit the upper with a heat gun for a short period of time and then the barrel just slide right in with the Aeroshell 33ms grease. Ridiculous how easy it was. Why anyone resorts to sanding or freezing the barrel is beyond me.
    I dont know why i never thought of that. When you consider the receiver is aluminum and is likely to expand more than steel would expand, and likely much more than steel would contract....Oh well, call me a dummy.

    I'm not frustrated. i'm not blaming any mfr for this.

  4. #254
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    Quote Originally Posted by luckydube56 View Post
    I dont know why i never thought of that. When you consider the receiver is aluminum and is likely to expand more than steel would expand, and likely much more than steel would contract....Oh well, call me a dummy.

    I'm not frustrated. i'm not blaming any mfr for this.
    Yeah its one of those duh kind of things. You can just do it on the next one.

    Sent from my Samsung Galaxy S4

  5. #255
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    Jun 2006
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    Quote Originally Posted by VIP3R 237 View Post
    I have also had problems with PXT barrels being extremely tight. My brother bought a complete upper which we then took apart and cerakoted. When we put it back together we had to freeze it and use a rubber mallet to get the barrel back in. And yet we taped the contact surfaces so no Cerakote was on the barrel extension or inside the upper. However it is a tack driver and consistently posts sub moa groups.
    There's your answer right there. Thanks for confirming our suspicions Viper.

  6. #256
    Join Date
    Oct 2014
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    Mine is bcm4 feeds and laser etched bcm logo with star in normal spot. Is this because BCM assembled my upper?

  7. #257
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    Yes.


    Sent from my iPhone using Tapatalk

  8. #258
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    Oct 2014
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    Also one more question. Compared to my bcm lower the upper finish is really rough, almost like sandpaper. Is this a normal finish for the new uppers or bcm uppers in general?

  9. #259
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    Aug 2012
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    Cheney, WA
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    I picked up a BCM 20" A4 during the sale and a BCM A2 lower from Rainier, and the match is perfect. The finish is just like my Colt. Not rough.

  10. #260
    Join Date
    May 2009
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    It's not rough but almost kind if chalky on my last three BCMs


    Sent from my iPhone using Tapatalk

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