Hi Sunray
I'm not trying to be a wise *** but it is funny that you mentioned M113's being made of aluminum. I was a gunner in an M60A1 tank. We use to shoot at some 113's that were positioned in various spots on the moving firing range. The .50 cal bullet (not even armor piercing) would go in through the one side and bounce around the inside, obviously turning anything inside to hamburger. I always said I never want to be in one of those things unless I was getting MED/VACed. Anyway I still have my doubts about an aluminium receicer on a FAL design. Hey at least we have a good thread going here.