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Thread: Folding BUIS for Armalite M15 gas block?

  1. #11
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    Quote Originally Posted by Blankwaffe View Post
    Thanks for the info.
    According to the information Im getting from the manufacturers so far,it seems the only answer to my question is to change the gas block if I want an accurate zero from a BUIS.
    I guess thats the direction I will take and end it all.
    What is MI telling you?

    What is Armalite telling you?

    Why does Armalite list a BUIS for their gas-block equipped M-15s (AR15 models) that won't allow an accurate zero? This isn't sounding right, and it sounds to me like you're mixing AR10 issues in with AR15 issues, i.e., put an AR15 BUIS on an AR10 and it won't work. OK, got it. But who's saying you can't put an AR15 sight on an AR15 gas block?

  2. #12
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    In my email to Troy he said his sight for the AR15 will not work on the Armalite M15A4 gas block.Apparently the Armalite railed gas block used on the AR10 and the M15A4 standard chrome barrels are the same part and is a non standard height from what I gather.Im waiting for Troy to call me back so I can get more detailed info on the subject.
    Then I called Armalite and the sales and customer service tech said they had no info to provide but had not heard of any issues.But was not certain and could not provide any info such as the railed gas blocks HOB etc..The tech said I would have to talk with their gunsmith,who is out sick today.
    Then I called GG&G and they were not sure due to the info I provided from what Troy said.
    Basically Troy started me on the hunt by saying the sight he makes will not work due to the Armalite M15 gas block.
    Im in a holding pattern at the moment.
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  3. #13
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    I'm interested in how this turns out. I also checked out the thread(s) on TOS and it sounds to me like Troy is blowing some smoke. There are a couple of threads where folks had problems with front BUIS's working on S&W , Armalite, etc. I find it odd that you don't often read of Armalite owners indicating they have issues with other mfg's folders, but MI has had a couple of problems with different paltforms. Things that make you go hmmmmm........

    Anyway, I don't know how long Armalite has been equipping rifles with railed gas blocks, maybe the problem is in their court. Hope you get this resolved relatively painlessly and to your staisfaction.

  4. #14
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    Yeah I cant find any information from any other source online saying the railed gas blocks on the Armalites are standard or otherwise.Ive spent hours trying to run this down.
    Maybe Troy is blowing smoke and that is why he never answered my followup email.If he does not return my call that will certainly be a sign of some sort.
    The gunsmith at Armalite is supposed to call me in the morning regarding this and my barrel nut issue.So I will find out for sure then.
    Now on Brovo Co. website they note that the gas block should sit .925" over the center of the bore for that sight to work.
    I checked my gas block and the best I can tell using a caliper the gas block is right at that spec...within a couple thousandths anyway which could be my poor math skills.
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  5. #15
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    took a while

  6. #16
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    Quote Originally Posted by Blankwaffe View Post
    Yeah I cant find any information from any other source online saying the railed gas blocks on the Armalites are standard or otherwise.Ive spent hours trying to run this down.
    Maybe Troy is blowing smoke and that is why he never answered my followup email.If he does not return my call that will certainly be a sign of some sort.
    The gunsmith at Armalite is supposed to call me in the morning regarding this and my barrel nut issue.So I will find out for sure then.
    Now on Brovo Co. website they note that the gas block should sit .925" over the center of the bore for that sight to work.
    I checked my gas block and the best I can tell using a caliper the gas block is right at that spec...within a couple thousandths anyway which could be my poor math skills.
    Measure from the top of the block to the bottom of the barrel.

    Then measure the diameter of the barrel. Divide by 2.

    Subtract that from your first measurement.

  7. #17
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    Quote Originally Posted by jmart View Post
    Measure from the top of the block to the bottom of the barrel.

    Then measure the diameter of the barrel. Divide by 2.

    Subtract that from your first measurement.

    Yup...thats exactly what I did... .921"
    The difference is probably my old and well used calipers.
    Looks like my gas block is in the range per Bravo's website.
    jmart you maybe right afterall....maybe some smoke blowing going on.
    If there is,it sure caused me some aggravation.
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  8. #18
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    Talking

    Quote Originally Posted by Battl3fr0nt View Post
    took a while

    Yeah Im a little slow.Sorry.
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  9. #19
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    jmart,
    None of my calls were returned by Troy.Thought you might be interested.
    To end this yet another long drawn out soap opera of mine...the Armalite gas blocks are the proper height.
    Thanks for the help folks.
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  10. #20
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    Quote Originally Posted by Blankwaffe View Post
    jmart,
    None of my calls were returned by Troy.Thought you might be interested.
    To end this yet another long drawn out soap opera of mine...the Armalite gas blocks are the proper height.
    Thanks for the help folks.
    What is 'proper'?
    I'm not from Missouri but you need to 'show me' for me to believe anything from ArmaLite. In other take a picture....

    Troy front sights are made for rails that are equal to the receiver height, I've not seen gas blocks that are equal in height to the AR10 upper receiver from ArmaLite...........are these new?
    If so how long have they been making them. The only .308 AR gas blocks I've seen that are equal it height to the receiver is from DPMS.

    My recommendation would be to get a low-profile VLTOR gas block, pin it and get a long enough rail to cover it and either get a MI or TROY folding sight or a fixed LMT MRP front sight and be done with it.
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