Page 3 of 6 FirstFirst 12345 ... LastLast
Results 21 to 30 of 54

Thread: Sighting in new BCM 14.5 middy with LaRue BUIS...is this a problem?

  1. #21
    Join Date
    Sep 2010
    Posts
    32
    Feedback Score
    0
    I actually have the same problem with a 14.5 carbine-gassed upper from BCM purchased about 18 months ago. I've been too lazy to send it back in for service. I posted about it here and decided it was maybe me but enough searches indicate it happens on occasion. Here are some other posts here. I know when I talked to BCM (excellent service by the way) they said if I sent it in, they'd take a look at it. That was before Xmas and it got too busy but I'd like to know what happens when you send it back in. I had decided to just buy a Bushmaster 0.040 tall sight but may just send it back.

    https://www.m4carbine.net/showthread.php?t=42485

    https://www.m4carbine.net/showthread.php?t=54954

    BTW, Grant sells the sight posts: http://www.gandrtactical.com/cgi-bin...n&key=TALL-FSP
    Last edited by Code7inoaktown; 04-25-12 at 02:03. Reason: added stuff

  2. #22
    Join Date
    Sep 2007
    Location
    Texas
    Posts
    63
    Feedback Score
    0
    A Matech set at 200 on a 50 yard range will bring the front post down about 3 clicks lower than the handle.

  3. #23
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    62
    Feedback Score
    0
    I got an e-mail response from BCM this morning. I sent them the pictures I posted here and I will wait for their opinion before I make any further decisions.

  4. #24
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    62
    Feedback Score
    0
    Chalk one up for BCM customer service!

    They were very prompt and felt it needed to be returned. Shipping label was sent and the upper is on its way.

    This speaks very highly of them.

  5. #25
    Join Date
    Aug 2008
    Location
    SE Illinois
    Posts
    178
    Feedback Score
    12 (100%)
    I experienced the same thing with two EAG uppers and Larue BUIS. I did not have this high of a FSP with the Troy sights.

  6. #26
    Join Date
    May 2010
    Posts
    847
    Feedback Score
    15 (100%)
    I wish I could see the Larue and how it is mounted. They are easy to get mis-aligned on the rail. You really need to visualize and feel it drop into place properly.

  7. #27
    Join Date
    Sep 2010
    Posts
    32
    Feedback Score
    0
    Quote Originally Posted by JohnnyNumbers View Post
    Chalk one up for BCM customer service!

    They were very prompt and felt it needed to be returned. Shipping label was sent and the upper is on its way.

    This speaks very highly of them.
    Yes, a lot of the "BCM is overrated dummies" don't understand how good BCM's service is. Lower chance of having problems, and if you have a problem, they fix it and fix it as soon as possible. They don't frak around and run you for weeks on end.

    Let us know what the result is. I may consider sending mine in too, although I do wonder if my Troy BUIS isn't mounted incorrectly. I'll double check that.
    Last edited by Code7inoaktown; 04-25-12 at 19:40. Reason: clarity

  8. #28
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    62
    Feedback Score
    0
    Quote Originally Posted by Code7inoaktown View Post
    Let us know what the result is. I may consider sending mine in too, although I do wonder if my Troy BUIS isn't mounted incorrectly. I'll double check that.
    I will most definitely update this thread when all is said and done. I'm expecting at least a couple weeks for my upper to come back. If it gets here sooner...then that's even better.

    In regards to the LaRue BUIS...I now know with a degree of certainty, it wasn't the problem considering I had the same result with two different rear sights. As far as it not being mounted properly...I don't see how you could get it to clamp down if it wasn't. There is a (for lack of a better term) protrusion on the bottom of the sight that fits down in between the rail sections to keep it aligned before you can even clamp it down. I'm not debating the idea that it can improperly mounted just like i'm sure there are individuals who can push a square peg into a round hole...but rest assured, I had it properly mounted.

  9. #29
    Join Date
    Sep 2008
    Location
    Texas
    Posts
    1,316
    Feedback Score
    33 (100%)
    There are now 4 known issues that involve BCM uppers. Now I'm not pointing the finger at that, it could be a combination of many factors but something is definitely amiss.https://www.m4carbine.net/showthread.php?t=104141
    https://www.m4carbine.net/showthread.php?t=103559
    Last edited by SW-Shooter; 04-25-12 at 20:04.

  10. #30
    Join Date
    May 2009
    Location
    Olive Branch, MS
    Posts
    521
    Feedback Score
    0
    Quote Originally Posted by JohnnyNumbers View Post
    Now from what I have read using M193 w/14.5" barrel and hitting about an inch high at 50 yards...should put me right on at 100yds. At least thats what I thought I read somewhere on this forum... I may be wrong.


    That first group is roughly 5" high from center. .
    Glad to see that BCM is making it right. As far as your understanding of zeroes, you are way off. A 100yd zero will just touch POA at 100yds. It will be low closer and further away. You should have a POI about 3/4" low at 50yds with a 100yd zero.

    If you are an inch high at 50yds, you will, as you discovered, be about 5" high at 100yds.

    A good source of info on various zeroes, sights, and sight posts can be found in this thread by Molon

    http://m4carbine.net/showthread.php?t=65679

    In fact, the first couple paragraphs address the 100yd zero, with a nice graph.
    Colt SP6920, LE6920, 6720
    BCM Lower/ARP 6.8SPC upper for hog hunting
    DD M4V5 clone, Troy 5.56 Carbine, S&W M&P10
    PSA Lower/BCM LW 16" middie CHF upper
    PSA Lower/BCM LW 14.5" middie upper
    2 PSA 18"6.8 rifles, PSA 20" M16A4 clone
    Remington 870, Remington 700VTR
    SA XDm9, XDm9C, , XD9SC S&W 1911
    Ruger GP100, Hawkeye77 Compact 6.8SPC
    Kel-Tec KSG, Marlin 336 30-30, HK 45C, VP9
    Sig 1911 Tacops, Scorpion 1911, M11A1, P226 Mk25

Page 3 of 6 FirstFirst 12345 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •