Current pistols dont benefit as much from crits as other weapons, so one of the ways to make them have a marginally better damage is to get as many special attack feats as you can and stack special attack damage bonus.
Mechanical Pistols are in this weird spot where they arent good at any niche compared to other weapons, it's true you can still complete the game with them in all difficulties, but it's not a easy task compared to all other guns.
I made this topic to highlight some ideas that could marginally make pistols a lot better.
AP cost to fire:
It's common knowledge that for some reason mechanical pistols can take up to 32AP to fire a single shot. compared to SMG's, Assault Rifles and even Snipers it's a really heavy cost, pistols would benefit heavily from a general AP cost decrease across the board, the changes to the rapid reloader was a step into the right direction in my opinion.
Feats:
-Gunslinger is a great feat, pretty much a must on all Mech Pistol characters, maybe the addition of critical damage bonus to mechanical pistols as a specialization would make them better.
Enchancements:
-Scopes: Yeah, this is correct, this idea might sound weird but letting Mechanical Pistols use scopes would be a great way of making them better, the Laser Sight would still have it's niche since it increases your precision by 10% compared to the regular scope that only grants 6% precision and 2% crit chance.
Frames:
Neo-Luger: Currently the most consistent pistol frame, it deals alright damage with special attacks as long as you have a smart module and use special attack bonus damage goggles, while also having an alright increase on precision. i have nothing to add about this particular frame
Hammerer: This is a special frame, for many mechanical pistol users the .44 hammerer is the go for weapon, and with a good reason
it's the only pistol with a extra to it's critical damage bonus, but it has such a huge damage spread that many compare using it to playing slots, maybe some way to reduce it's damage spread would make this particular frame excelent.
Falchion: You'd think this frame is decent because of the extra critical chance, but it has a lower base damage compared to the neo-luger, and since only sharpshooter can give it a marginal crit damage bonus the damage falls off, even more because neo-luger can also benefit from sharpshooter while having a better base damage, a increase on the Falchion frame base damage would be a welcome buff.
Hawker: Sold as a middle of the road between neo-luger and hammerer, but it lacks consistent damage of the neo-luger or the big crits of the hammerer, all in all the only change i could suggest is for the hawker to have a lesser AP cost to fire compared to the other pistols.