Master critical fundamental skills
Improve accuracy quickly
Save thousands of dollars on ammo
Used by all branches of the Armed Forces
Highly recommended by professional instructors
 
The Mantis X2 is the most powerful training aid for dry fire only practice. 
There is nothing at this price point that will give you this level of feedback for dry fire.
The X2 mounts to standard universal accessory rails.  (No picatinny rail?  We have adapters).