But but- I made plans for it already :(

Animations are simple enough just like how they do reload animations except this is no reload NO RELOAD, internal flaps from inside the barrel comes out elonging the barrel for a more proper HMG look. Since it'll be rail based, theres no need to add extra animations for spinning but preferably a change into a more lighter tone when firing. Small flaps on the side of the FG can open to reveal gill-like exhausts to vent rapid fire FHMG. The giant FG bullet will have to turn into tinier rail bullets that illuminate the ground with a blue hue.

Only thing that could be a little more complicated is creating a secondary ammo type which seems easy enough
FG has 12 shots
HMG has about 1200 I believe
That means for every 1 FG shot, it would take away 100 FHMG

For the sake of differentiating FHMG from HMG, I would lower ammo count (both capacity and max ammo), increase damage, lower rate of fire. When you get hit by it, you'll KNOW you're getting hit by it.

CCP/GM you can move this thread to suggestions if you can get one of the weapon devs to look at this :(

No, the forge is meant to be the caldari heavy variant, you will get a gallente plasma heavy weapon and an amar laser heavy weapon!!

Imagine the forge gun could transform into a rail machine gun with a push of a button.

My money is waiting CCP.