GEMTECH's subsonic 300 Blackout ammunition was created to give the quiet shooter an affordable and dependable training round. Features a 187 grain polymer tipped projectile that provides excellent stopping power. While it is optimized for suppressed weapons, it works well in loud guns too. The ammunition is brass cased, boxer primed, and noncorrosive. Packaged 20rds to a box, 500rds (25 boxes) to a case.