Rock River Arms 6.8mm Steel 25 Round Magazines have a welded steel construction with a special spring and lubricant coating. Dont get caught out on the range reloading, we all know the range is for shooting. Pick up a few extra magazines for both the range and the field and stop messing around with loose bullets. This replacement or additional magazine is a factory original, meaning that it is made to the exact same specifications that your original magazine was made. Factory magazines will always work great in the intended gun. The days of frantically searching for your magazine before hitting the range are over when you buy this extra magazine.