BarrelBlok™ 9 universally fits into any semi-automatic pistol chambered in 9mm (9x19, 9mm Para). Each BarrelBlok™ 9 comes with one (1) BarrelBlok™, three (3) MagBlok™ magazine inserts and an instruction booklet. Your firearm does NOT have to be disassembled to use BarrelBlok™. Simply insert BarrelBlok™ to train, and remove it to return your firearm to its ready state. BarrelBlok™ is SAFE, REALISTIC, TRAINING!