As those who have had AR's for lo these many years know, loading the magazine is pretty easy for the first 15-18 rounds but after that, for me at least, the 5.56 is like trying to put a minnow through the eye of a needle. So I spent a couple bucks and got the Maglula M4 5.56 loader. The thing is AWE-SOME. Goes over the top of the magazine and the loading arm goes front-to-back, then back-to-front as rounds are loaded. Took maybe 30 seconds to place and figure out, and then maybe 60 seconds to load the magazine. I recommend.