Airsoft3D M4 M16 Receiver Picatinny Mount Adapter Type I (20mm) for Airsoft / SoftAir Rifle - TeleScopix Shoulder Stock System Color:Gold This adapter is compatible with

This adapter is compatible with all action cameras that uses the GoPro mount interface

And it's easy to pop the battery off

It attaches to the Picatinny mount on the receiver side

com/thing:1388709 (by Donovan Moore aka dantius)

Airsoft3D M4 M16 Receiver Picatinny Mount Adapter Type I (20mm) for Airsoft / SoftAir Rifle - TeleScopix Shoulder Stock System Color:Gold This adapter is compatible withThis receiver adapter is part of Airsoft3D TeleScopix Shoulder Stock System. The TeleScopix shoulder stock system allows you to customize airguns, airsoft guns, foam dart ball blasters, and paintball markers for the perfect height, length, and aesthetics. Build a gun for maximum ergonomics, performance, and mobility. This receiver adapter provides a Picatinny mount at the back of the receiver to allow attachment of other devices, such as our shoulder