Bugger, already drawn a side profile of a M15 and the damn thing is on it's side...have to rotate the monitor I guess.

If I can get out of going to a kids party in the morning I'll drop it in and then try to find some more links to annoy John!
I assume they weren't always prepared for a quick game of rugby but the thing was to catch spent casings. Sticking the drum mags on at 90° must have been fun as well.