Compatible with Glock Double Stack 9mm - G17, G17L, G19, G19x, G26, G34, G45, G47, G49; Compatible with .357 Sig - G31, G32, G33 with additional purchase of .357 adapter; The SureStrikeMag combines the Smart DryFireMag by DryFireMag, LLC and the original SureStrike laser cartridge by Laser Ammo; This product allows you to train with your own pistol; They provides instant feedback with an eye safe Red laser; You can use the SureStrikeMag with any of the Laser Ammo reactive targets; The SureStrikeMag is easy to set up - You just insert the laser cartridge into your firearm chamber; You can practice your trigger control, sight alignment, grip, stance, speed, marksmanship and more; The SureStrike laser is made in Israel, built from a stainless steel body; The SureStrikeMAG is set to simulate a factory Glock 5.5 - 6lb trigger weight