The Neptonic GoPro Mounting System is modular and can be deployed on the left side or right side of the gun as well as upside down.

includes:
GoPro Tripod Adapter
2 Part Barrel Clamp with Positive Alignment System
Universal Mounting Arm (works on the right/left side)
Insulating pad Prevents cosmetic damage to your gun
Thumbscrew for fast & easy On/Off