ETS has been making good aftermarket magazines and they just got better. They started by improving the internal geometry so that rounds could be more reliably fed from more firearms. Working out they sought to improve the magazines' durability by changing the base plate and improving their polymer formula so that you could get more from your magazine. For faster reloads, the magazine also comes with a coupler system integrated into the body. With all of the improvements this magazine just waiting to come with you to the range.