[John Coleman]

Some barrel blueprint drawings and info at these links.

http://www.milsurps.com/content.php?r=420-Blueprints-for-M-14-Rifle-Barrel-Part-7790910

http://m14forum.com/reference/39849-m14-nm-barrel-dimensions.html

http://www.silencertalk.com/forum/viewtopic.php?f=70&t=11789

http://www.ar15.com/forums/t_6_6/250481_Thread_Pitch_m14.html