I've used probably every low quality mag out there. they worked fine in my JLS scar, but they misfed every other shot in my KWA m4. Its not the gun, the mags are just crap. I own 3 of these mags and they work magnificently. they don't misfeed at all and they do hold 360, not 300. I counted. Although they are over double the price of crappy mags it is worth having these. When you wind them up all the way you will shoot all 360 rounds on that one wind. I wouldn't recommend doing that because you can break the coil in there and thats really bad. This honestly has to be best mag out there. I've seen G&G, CA, and this one is better for sure.
360 BBs instead of 300
very easy to wind
fits great in my KWA (obviously)
better than every other brand of m4 mags
like the guy below me these mags got in some rain and have little rust spots on them, but mine came off just by wiping them with my finger
Overall great mag. just don't get them wet and you'll be fine.
Rating: [5 of 5 Stars!]