This is a mantis Blackbeard dry firing tool for AR15’s. This allows you to train with your AR without having to reset the trigger yourself because it does it for you. The battery lasts a whole and it resets pretty quickly. It does not modify your trigger so you train with the actual feeling of your trigger. The price for it is $350 and I’m asking for $275. It’s still in good condition I’m selling because I no longer have an AR to use it.