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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 09-19-2010, 1:16 PM
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MaHoTex MaHoTex is offline
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Default AR15 upper dimensions

All,

I have purchased 2 AR lowers and will make one an all black M4 style evil zombie killer. The other I would like to make a scoped long barrel type. In order for me to determine the desired length of barrel, I want to create a mock up, but need the dimensions of the upper. Does anyone know where I can find a mechanical drawing of the dimensions for the AR15 upper? I plan to use the JDM Tech upper, though I do not care what spec drawing I have to pull dimensions from. All should be close enough for my purposes.

I am not decided on a 20" or 24" barrel, and just want to physically see the length differences between the 16/20/24 length barrels. I can not seem to visualize it in my head.

Should also add, I am thinking A3 flattop design.
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Last edited by MaHoTex; 09-19-2010 at 2:07 PM..
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Old 09-19-2010, 7:54 PM
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Go to Harbor Freight and buy a 25-ft retractable measuring tape for a buck fifty. Go home and use your bedroom wall and measure out the length of what you want to see: 16", 20", and 24". Mark it with crayon in different colors so you can visualize better. Better yet, you might want to draw the barrels out in different lengths and colors.

Assuming you know how to use and read the measuring tape....

Now you can visualize all day and all night long in your bedroom what you want to build.

You want scope? Draw the scope....
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Old 09-19-2010, 8:21 PM
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Are you for real? How am i supposed to put that into autocad? Now, how about something useful, like a mechanical drawing with dimensions?
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Old 09-19-2010, 8:29 PM
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Quote:
Originally Posted by MAlexander View Post
Are you for real? How am i supposed to put that into autocad? Now, how about something useful, like a mechanical drawing with dimensions?
You didn't say autocad at first!

Here you go for barrel dimensions:

http://ar15barrels.com/profiles.shtml
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Old 09-20-2010, 8:17 AM
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Thanks! Now, If I can get my computer screen to accept input from my Crayons I will be good. :-)
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