Effectively and easily save high price brass. No need to waste time in picking up brass from range. If you hate policing your brass, this is one to consider. The springy frame is stiffer and larger compared to other brands, the caught brass won't twist the frame which will not cause ejection failures & jams. The zipper in the bottom of the light mesh bag is designed for quick shell empty. Velcro strap design, easy to install on rifle barrel with high density soft nylon hook and loop band there is no interference with optics no matter how you mount them.