Describe the bug

If i spawn in, any sort of Aircraft, the machine guns, simply do not work. Everything else works, except the driver machine guns. i Put in the right ammo, i was on creative mode, and, the machine guns do not work on the planes and helicopters.
To Reproduce
Steps to reproduce the behaviour:

1. Open Minecraft.
2. Go to Singleplayer.
3. Try to fire the plane machine guns all loaded up and ready.
4. See if it works.

Expected behaviour

I expected the guns to fire. Also, i do not understand what the "gun key" is. i set the gun key as my Right Mouse button.
Screenshots

Versions (please complete the following information):

• Forge: forge-1.12.2-14.23.5.2836
• Flan's Mod: Flan's Mod-1.12.2-5.5.2

Additional context

You're on an old version of the mod.
Download the latest version from here: https://github.com/FlansMods/FlansMod/releases