I know they work with .lua, but I have a doubt with another part of the gun.
How does the .ini part work and how do you script that?
Thanks.

It depends on your technique. If you are using a ray, you will want a gun that fires an invisible, harmless round which disappears immediately. If you are using a visible round you might want to use a TDExplosive with low to none GibImpulseLimit. There are a huge number of ways you might be able to do it.

Well, I'm using a Flare Gun.
Basically, a grenade launcher that fires flares (the TDExplosive) which gibs into many glowing MOPixels and an AEmitter.
Then, how would I make it considering it is a TDExplosive?

You'll want the script linked to the TDExplosive, triggering on the destroy function.

Or you could make something, could be TDExplosive that is scripted to spawn a bomb spawner every X milliseconds after Y amount of time. I make my air strike flares using this technique.

Oh, and I never make the bomb spawner a gib of TDExplosive, don't know why but it doesn't seem to work well.

So, what I should do on the TDExplosive is this?

Something like that.

Ok.
Now going to the Lua forum to ask for the next part.
Edit: I feel like an ass for almost asking the entire lua script to make bombs rain... I'll learn Lua first, try to do it by myself and ask later.