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Posted: 10/25/2013 7:54:52 PM EST
How high over the center of bore is a flat top AR upper?

Thanks
Link Posted: 10/26/2013 7:25:14 AM EST
Good question, if I had a 3d model I would measure it for you !
Link Posted: 10/26/2013 9:23:54 AM EST
Easy way to find out. Lay the upper on a flat surface with the rail down and measure from the surface to the center line of the barrel.
Link Posted: 10/26/2013 10:51:16 AM EST
[Last Edit: 10/26/2013 6:46:30 PM EST by Forester458]
I've heard various opinions but the one quoted most oftem seems to be 1.215".

I've never found an actual spec listed anywhere though.

Edit: See next post.....
Link Posted: 10/26/2013 12:39:38 PM EST
Look from the last cross section drawing at the bottom of the pdf AR15 Upper Receiver (Flattop) drawing link below:

1.875 - 0.625 = 1.250" (ignoring tolerances)


1.875" dim from bottom edge of upper receiver to top of flattop rail

0.625" dim from bottom edge of upper receiver to center of barrel hole


http://www.weaponeer.net/forum/uploads/appletech/files/2009-02-27_015736_AR15A3_Upper_COLOR.pdf



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