Add a laser without taking up the real estate.   Also perfect for your pistol build.

Viridian Weapon Technologies, HS1, Hand Stop, Green Laser, Includes M-Lok mounting hardware, Double Pressure Activation Buttons, Adjustable Windage and Elevation, Black

Viridian, the leader in weapon-mounted technology, is responsible for a number of firearm innovations - including green and red laser sights.