Are there any ways to increase crit chance? The shotgun is ridiculous when it crits, especially the way I'm building it, and if I can get my crit chance to around 50%, the damage output will be ridiculous.
EDIT: Also, does each pellet have its own roll for whether or not it crits?
Seeker goggles give you up to 19% crit chance (though it'll be hard finding ones of that high quality, and you'll need pretty high electronics to make them).
Focus stim drug gives you +15%. Takes 50 biology to make, but they use common ingredients so they're easy to mass produce. They also last a minute so they barely ever run out before fights are over, even if you use them ahead of combat.
Infused rathound (regular rathound, not ancient) leather armour gives you a bonus. 100 quality is worth +8%. 120 quality is worth +10%. 155 quality is worth +13%.
Core chips give you +2%. Hardcore chips give you +5% but also make it more likely for enemies to crit you.
Recklessness feat gives you +7% but makes it more likely for enemies to crit you. Body Horror feat gives you +3% against non insect animals. Scrutinous feat gives you +7% with no drawback but needs level 26. Pellet mayhem gives you +3% per enemy hit with your shotgun (but the bonus resets per shot, so you need to keep hitting multiple enemies every time you fire for it to be worthwhile). Ambush gives you a huge crit chance bonus but it requires the lighting on both you and the enemy to be right, which can be hard since shotgun optimal range is pretty short. Survival Instincts also gives you a massive bonus but it needs very high constitution to take and only works when you're at low health.
Psychostatic Electricity feat means electric psi abilities increase the chance for enemies to be crit every time you hit them, but that's way too much effort. Energy pistols with polariser are the same story.
I think that's everything. If we assume you use seeker goggles worth 15% then focus stim+hardcore chips already gets you to 39/40% crit chance without having to give up anything important. That's enough to make vindicator/despot pretty nice already. If you can afford to take the feats or use rathound leather then it just gets better.
Each pellet does crit individually. Look at the combat log, it'll say x/y pellets crit when you shoot.