Help HK416 A5 AEG

[Kb24]

I have a VFC Hk416 A5 with ambi mag & Bolt Release.

 

i dropped in a complete Gate eon Gear box at first neither would fit. I have managed to dermal down the mag release to get working on both sides.

 

now I’m looking for a work around to get the ambi bolt catch/release working.

 

has anyone came across this issue and over come?

 

Any help appreciated, Thanks 🙏🏼