This inexpensive mag loader makes loading high capacity mags a snap without breaking your thumb.  Its a simple box loader, such as is used on M11/9 mags and grease gun mags, that slips over the top of the mag and easily pushes the round in the magazine down so you can slip the next round into the mag with no effort.  You better order at least 2 of these, since you know your buddy is going to want one!