Ruger 10/22 Red Laser Sight System with Picatinny Mount
Amazon.com : ArmaLaser TR28G Designed to fit S&W M&P 380 Shield EZ, M&P 22 Compact and M&P 9 EZ Ultra Bright Green Laser Sight Grip Activation Smith and Wesson [Won't FIT Standard
Ruger LaserMax Laser Sight for Ruger 10/22 | Highly Rated Free Shipping over $49!
Ruger 10/22 Laser from LaserMax -The Firearm Blog
Viridian Essential Red Laser Sight for Heritage 22