"I bought these exact MAG brand midcaps from a different retailer. Like AMS says, these hold more like 100 rounds than the advertised 130. The build quility is 'barely there,' not being anything close to even King Arms mags. They are the trickiest things to get feeding at first, and it took me DAYS of what seemed like constant lubricating and loading/unloading for them to feed properly. If you are good at keeping your mags from dropping onto the ground, these will do the trick, but if you're someone who likes to 'leave to retrieve' then stay away and get something more durable. overall they do the job they're intended for. One more thing to note: the color is not 'gunmetal gray' it's more of a glossy gray. MAG has done a good job to get affordable magazines onto the market, but you get what you pay for, and not much else."