In both my first and second playthroughs of Terror from the Deep, I equipped some Mantas with dual gauss cannons to see how they would do against an assortment of small and medium subs to see their performance. I knew they certainly wouldn't be better than sonic oscillators, nor should they be.
But holy crap.
I don't see how it was possible that someone could make a weapon that was worse than the extremely short range laser cannons from the first game, Jesus Cthulu on a rolling donut.
Let's count the features.
1. fifty rounds instead of 200.
2. The firing rate is appallingly bad for a "cannon type" weapon. It seems like there's a two-second gap between shots.
3. You have to manufacture ammo whereas the laser cannons recharge on their own.
4. Damage and range and accuracy are about the same, which makes the gauss much slower to kill because of its very slow firing rate.
I think it needs maybe not a damage buff, but an accuracy and range buff. I can't help but think that the gauss cannons should really utterly replace your tier-1 craft weapons, same as the gauss (should) do for your gas tech weapons.