The rounds are on a stripper clip, and the go into a "spoon" which attaches onto the spline of the magazine. They've been around for a while and are super handy. I have about 500 of them, but only bother to load them before a carbine class or an all day shoot. Check out the maglula, its a nifty lil gadet that can accept a stripper clip of loose rounds I find them indispensible. Btw it usually takes me about an hour to load up 1000 rounds on to strippers, taking my time with a friend nursing a bill. I really find them almost a must have for a class as I'm usually dying to get back on the firing line and hate wasting time loading up.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul