Here are two:
//www.marstar.ca/assembly-disassembly.htm
//members.tripod.com/~kile_r/lvl25.html
Another which I had accessed a while ago but can't seem to get to come up now was at:
//www.gunsites.com/explode
Undoubtedly you'll find more with a good search engine, try google.com, usng the key words 'guns exploded views'.