Andoer 20mm Gun Rail Mount Center Mount Picatinny Weaver Side for Gopro 1 2 3+4 This is a gun mount for the GoPro HD Hero camera. Seconds to install -slide the mount over the rail, tighten, and clip-in your GoPro camera. Can be used with airsoft, BB guns, paint ball and basically any gun that has a Picatinny/Weaver rail. Great for hunters, military, law enforcement, recreational shooters, and airsoft players. Suit for your Gopro 1 2 3 3+ 4 camera.