SODIAL(R) 20mm Picatinny Weaver Gun Rail Mount for GoPro Hero1 2 3 3+ 4 Sport Camera Gun rail mount for GoPro Hero1 2 3 3+ 4 cameras. Get first-person-shooter style shots or reverse the camera on yourself and watch yourself in action. Seconds to install slide the mount over the rail, tighten, and screw-in your camera. Works for standard Glock style gun rails. Perfect for hunters, law enforcement, recreational shooters, and so on.