Several Gun Blue Prints
 

Was just snooping around and found this... I think it might be a repost. i searched for it on ASC and found nothing. if it is just delete this post... enjoy =)
p.s. - there are some videos and some printable targets

http://www.nlairsoft.com/downloads.php

Pretty sure I remember seeing this site before, and we do have a thread with gun diagrams on here too, but it's still a good link.