What's the hight differance of the gas block and the flat top rail?
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Thread: What's the hight differance of the gas block and the flat top rail?

  1. #1
    XCR Guru dont_tread_on_me's Avatar
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    What's the hight differance of the gas block and the flat top rail?

    I'm not sure if this is in the right section or not,but here goes.I have the promag buis for the front and rear for my xcr.The problem is,I didn't notice when I ordered them that the front is for mounting on a railed gas block.I noticed the problem when I went to zero the buis and the shots were about 18" low at 25 yards.I figure all I need is a riser to raise the rear sight,but I'm not sure of the height difference between the two.Dose anyone have any ideas? I suppose I could always buy a front sight designed for mounting on a full length upper rail,But the idea of dropping a hundred bucks on one don't exactly make me all warm and fuzzy.



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    Carbineman faawrenchbndr's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    That is the best over all fix. Front sight needs to be a full length rail model.

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    Marksman Carl AMG's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    Had the same problem when I first got my rifle and the dealer send me the YHM gas block sight. I returned the bad part and got the proper one on the rifle once I figured out they sent me the wrong part.

    I would try to exchange for the proper sight.

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    XCR Guru dont_tread_on_me's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    From what I can tell by measuring there is about a 1/4 difference in hight,but the only risers I can find are 1/2.Will that be too much? Can you adjust the front sight elevation to compensate?



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    War is an ugly thing, but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks nothing worth a war, is worse.... A man who has nothing which he is willing to fight for, nothing which he cares more about than he does about his personal safety, is a miserable creature who has no chance of being free, unless made and kept so by the exertions of better men than himself.----John Stuart Mill

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    Carbineman faawrenchbndr's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    You will not be able to compensate for that much of a difference.
    My suggestion, list the sight for sale here or at another site.
    Then purchase the correct height sight.

  7. #6
    Marksman Carl AMG's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    Quote Originally Posted by faawrenchbndr View Post
    You will not be able to compensate for that much of a difference.
    My suggestion, list the sight for sale here or at another site.
    Then purchase the correct height sight.
    +1...you can't adjust the sight post enough to compensate.

  8. #7
    Marksman roughneck2zero's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    I haven't messed with that for awhile, but I think the height for the front sight post on a gas-block mounted sight varies between 50-55mm, while both rear & front sights for a monolithic top rail is 45mm.

    BTW: 1 inch = 25.4mm, so 1/2 inch would be about 12.2mm

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    XCR Guru dont_tread_on_me's Avatar
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    Re: What's the hight differance of the gas block and the flat top rail?

    Has anyone ever seen a riser thats less then 1/2 inch in highth? It's looking like I'll have to just bite the bullet and buy a front sight for the rail instead of the block,I'm thinking midwest industries.I kinda dig the half circular protective ears on them.The choices for front sights that are rail mounted seem to be fairly limited.



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