On Midway $26.95
On LuckyGunner $26.95 (almost 3,000 in stock)
If you shoot a lot most likely you buy your .223/5.56 ammo in bulk, as military surplus or overruns. Often this ammo comes on stripper clips, and in the metal box with the ammo is usually a couple magazine guides for those stripper clips. Theoretically you can slip the guide onto your magazine and simply slip the clip of ammunition into the top, then slide them in.
Unfortunately, those guide pieces never work. There is just too much force required to load the rounds into the magazine, so the guide usually just folds to the side, or it actually bends and becomes useless.
MagLULA, the company you probably know that makes a whole line of easy mag loading and unloading tools, came up with a nifty tool that you can throw in your shooting that actually works on stripper clip loaded .223/5.56. It retails for just under $30. We tested the tool in an afternoon of shooting and it works great. You can also load loose rounds 10 at at time, but the real timesaver is with actual stripper clip ammo. Finally the stuff works like it is supposed to!