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AR15.COM
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7/29/2007 6:26:58 AM EDT
The channel at the rear of the mag well is supposed to be 0.470 inches, at least according to the drawings I looked at.

My mag well is a bit snug so I measured my mags and found quite a difference:

C-Products (6.8 SPC 25 round)      0.46
Barrett (6.8 30 round)                  0.41

Maybe they vary within brands, but mine are consistent. If any of you happen to measure, it would be useful for those of us with SMW to post the measurement for various brands.

http://i3.photobucket.com/albums/y90/patentmike/IMGP1376.jpg


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