The Arrow Lazer is a pretty nice tool for gunfitting. In addition to the loop you can put on your finger to touch the trigger and activate the lazer, there is an add-on accessory called the "coach's button (or something like that.) It allows someone else to activate the lazer. I use this "button, and I have the customer mount his gun as he were firing at a target on the wall. I tell them to say "now" when they have acquired the target and I activate the lazer. You can get adapters for it to accomodate 20,28 & 410.
At one time, and he he may still, Chris Batha promoted and advocated this system for traing and gun fit.
Hack
