Don't waste your money. There are many reviews on this trigger and the general consensus is that it does not work. Many of the reviews are videos, and no one can get more than two or three shots and it stops. All were testing on AR15s'. One guy compared it to a real full auto gun, a Geissele trigger, and the Tac Con trigger.
Full auto was rapid fast. The Geissele trigger was slower, but close to full auto, considering the trigger was manually pulled for each firing. The Tac Con was poor, and not fast at all. All the testers said that they spent several hours using the Tac Con and could not get the trigger to run bursts, but thought with many hours of more testing, that it might do better, but consistency would always be an issue. They all said you won't likely install the trigger and get results right away, if ever. And forget about using it on a 22LR, as with the low recoil the design would never work.
I have a SlideFire stock, cheaper and very reliable. I can empty a 30 round AR mag in three seconds, and about the same time for the 25 round 15-22 mag. A switch of the SlideFire between different rifles takes under five minutes. Just remove the stock, unscrew the SlideFire grip, and install on another AR style rifle. I can easily control short bursts of 3 to 4 rounds, depending on my finger or forward push of the handguard.
Bob