dimensions for AR-15 flat top upper reciever
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  1. #1
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    Default dimensions for AR-15 flat top upper reciever

    I was playing around with some extra material in the shop and thought I would make a floating handguard for a AR-15. However I wanted to make it so you could install a Picatinny rail on top and have this line up with the ones on the flat top upper receivers that are so popular. As I dont own one myself I would like to know what is the distance from the centerline of the barrel to the top of the Picatinny rail and is this a standard or are all manufacturers different?

    Charles

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    PM a real email address to me and I'll send you a PDF of the upper prints that came off the 'net. -Mike

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    Quote Originally Posted by Holescreek View Post
    PM a real email address to me and I'll send you a PDF of the upper prints that came off the 'net. -Mike
    Hi Mike.........IM sent, I'd like a set of these please.

    Thanks, Brion

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    Quote Originally Posted by Holescreek View Post
    PM a real email address to me and I'll send you a PDF of the upper prints that came off the 'net. -Mike
    Is this offer still open?

    Thanks in advance,
    Cody

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    Cody - If you haven't done it, send him a PM directly. I checked and he is still on the forum but sometimes people don't check in on 10 year old threads.

    Steve

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    My guess is that there is no standard for height of a Picatinny rail above the bore. I have at least two flat-top uppers and one is really low and requires extended rings and a lift bar while the other is really high and uses standard rings.
    Last edited by GGaskill; 02-12-2019 at 09:54 PM.

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    Most of the drawings that were hard to find 10 years ago are now readily available on the net in jpeg or PDF formats. I just did a quick google search for "AR15 upper receiver drawing" and saw the dimension you are asking about in the second image I looked at. I just went to Scribd and downloaded one for free just to see if it would work: Blueprint Upper Receiver M16A4

    I believe GGaskill might be on to something though, unless there's been an agreement about rail heights that I'm not aware of it could be a crapshoot. I'd check out some Ebay ads to see if there is any mention of rail height differences and possibly even wade into the muck on AR15.com for an answer. I haven't messed with an AR in a lot of years.

    Depending on your capability to use the files, CNCgunsmithing has free file downloads here: CNCGUNSMITHING - www.cncguns.com - Downloads

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    You could go with the GI spec standard height for M4 and M16A4 of 1.222" from center of bore as per drawings.

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