FMG-9 unable to install any sight

[MrRedstoneA1]

Describe the bug

The FMG-9 has a bug. If you remove the iron sight, you can't install any sights or scopes anymore.
Easy to reproduce. Hit G and take off the iron sight. Try installing any sight. You can click all you want but the sight isn't going on.
This issue only happens in survival mode. You can install sights on the FMG-9 in creative mode.
I also pasted the log though I doubt it'll help.

Reproducibility

• I reproduced this issue with as few other mods as possible installed.
• I am unable to reproduce this issue consistently.

Screenshots and/or videos

No response

Logs

https://mclo.gs/vzE5E40

Debug Logs

No response

Crash Reports

No response

MWC Version

0.1.7

Forge Version

1.12.2-14.23.5.2860

Red Core Version

0.5.1

MixinBooter Version

9.3

Java Version

1.8.0_421

Java Virtual Machine

OpenJ9

Operating System

Windows 11

GPU Vendor

NVIDIA

Code of Conduct

• I agree to follow this project's Code of Conduct