Airsoft - AK47 Jing Gong RIS kit adjustment for Cyma CM028

This is an anti wobble device created for the Cyma CM028 when fitting the Jing Gong RIS kit on it : it does not include the RIS kit.
This device has two purposes :
- prevent the vertical and horizontal wobble
- prevent the cleaning rod to fall inside the gun's body (WiP)

It is designed to be screwed inside the front of the lower part of the front guard. It is based on the small device designed to go in that place for another brand, for adjustment purpose too.
If it works on other guns, b