Also have a lula mag loader - Maglula M4/AR15 5.56/.223 LULA Loader & Unloader

Not the fastest mag loader on the market, but I could see if you were on the run and mags were running low, you could borrow a strip of rounds from your SAW gunner and it would be a more efficient way of loading your mag as opposed to pressing them in from the top. Not that I expect to find myself in a running gun battle anytime soon, but would be a lightweight and indispensable piece of gear to carry with you. Better to have it and not need it than to need it and not have it.