Review by Chris O for Rating: The price is definitely right on this prcdout. I bought two packs of two, and just gave a pack to my brother because they are so cheap. I use them for speed loading my Echo1 M4 mags, and they pretty much do what they are supposed to do. It won't always load four bbs with each depression of the plunger, but it beats manually sticking them in. As for use with a gas blowback pistol,i tried to use the adapter included, but it didn't seem to work very well on my KWA USP mag. I haven't tried it on any other gas mags, but it doesn't seem like it is strong enough to do it.The speed loader is the size of a pistol mag. That means you can easily store it anywhere you would normally store mags. One thing to be aware of, however, is the little pin that locks the plunger down. Since the plunger is spring loaded, it will always stick out and possibly get broken off if you don't press the pin down and lock it in place, flush against the top of the loader. It is very easy for this pin to get accidentally pushed back out and the plunger will pop back up. To remedy this, i put tape over one side of the pin. when i want to use the loader, i peel the tape back. it isn't the most elegant of solutions and takes a few seconds, but i would hope not to use this loader in the midst of battle anyway. Bottom line: this loader is useful for loading aeg mags ahead of time. It beats using those stupid tubes and rods. These are extremely cheap, and they can fit anywhere. They aren't the highest quality of prcdout, but they get the job done for a ridiculously low price.