I just picked up an M1 today. Ive been after one for a while so I'm pretty excited. Id like to get a handful of high cap magazines for it. Does anybody have a recommendation of what manufacture to pick up? Ive heard they can be a finicky and needless to say I don't want that. http://www.keepshooting.com/firearmaccessories/magazines/m1-carbine-30rd-mag.htm These guys are inexpensive and suggest they are the best, any opinions?