Just the coolest - Viridian Weapon Technologies HS1 M-Lok Mounting Infrared Laser

Not very expensive. Super cool. I don't know of another front stop with laser. The ability to co-witness with my red dot is great. I have about 7 of them now. Not sure how it holds up with higher caliber repetitive force because I haven't used on anything except .22, 9 mm, and 5.56, but it's obviously more of a close range/low energy device anyway