GoPro Rifle Mount, Works with Shotguns and Pictatinny rails too

My GSG-16. Does anyone know why there's a rail on the stock? I can't figure out any purpose for that. : r/22lr

SIDEKICK GoPro Camera Picatinny Rail Mount -The Firearm Blog

Action Camera Cantilever Picatinny Weaver Gun Rail Side Mount Adapter Compatible with Gopro Hero 12/11/10/9/87/6/5/4/3 Session/Session5/4,for Shotgun Hunting Rifle Pistol Carbine Airsoft(New Version) : Electronics

AK Tactical Aluminum Rail Gun Mount Gopro Camera Hero Wiv Worker MOD Rail Nerf Battle Gear - Denmark

Lancer Tactical GoPro Mount for RIS – Airsoft Atlanta

45 Degree Offset Rail Mounts Offset Picatinny Rail Mount Low Profile Weaver Aluminum Angled Rail Adapter Allen Wrench, Check Out Today's Deals Now

SIDEKICK GoPro Camera Picatinny Rail Mount -The Firearm Blog

RAIL DOGZ 3-Prong Side Gun Rail Mount for GoPro HERO 2-Prong Mounting – Fotodiox, Inc. USA

Caldwell Picatinny Rail Go-Pro Mount Aluminum Black 123905 [FC-661120239055] - Cheaper Than Dirt

GoPro Gun Mount! Works with Shotguns and Rifles.

GoPro Shotgun Mount

Locking Rifle Mount - Raptor Picatinny™ - ODSGear

Matrix 3/6 Burst Firing Multi-Shot Gas Powered Airsoft Shotgun (Model: Tactical w/ Shell Caddie / Black), Airsoft Guns, Airsoft Shotguns - Airsoft Superstore