Shameless necro as this build is pretty timeless and good in conserving it's relevance.
I fiddled around in the character planner, trying to set up a pistol build and eventually arrived here. With a specialized Hit & Run, it was very tempting to make one with Versatility, Gun Fu, Dirty Kick and Execute, but I had to come to the conclusion that it just doesn't worth to give up a lot of feats and the convenience of being able to precisely land shots from afar.
So, the main thing I thought I would change is to remove the Throwing skill and Fatal Throw altogether.
It would not only save us some skill and specialization points, but the main reason behind this is that it's simply not that useful being a free finishing move for those below 25% health - not to mention it can only happen once.
Instead of this, with a heavy heart, we drop 2 DEX in order to raise STR to 5. This would make Bullet Time shots cost 8 AP instead of 7... a dire price to pay.
However by dumping Fatal Throw and the now even less useful Pack Rathound, we can take Snipe and Shooting Spree and specialize the latter for 1 point in order to get two completely free shots from a sniper rifle.
That's TWO surekill attacks for free - instead of a single, very situational finisher that might still not even kill it's target.
So for +1AP cost of each pistol attack, you can alpha-strike with a free Snipe and Aim Shot from a 12.7mm sniper rifle. That's making each battle having -2 contestants of your choosing throughout the game - and now you can also add Steadfast Aim.
https://underrail.info/build/?HgUMBwMJAwfCoEgAAAAAwqBXPQA9eHAsO3AAAABGYQBBKxcBHRkqNX7DkjE6HlszS8KFwrXCpOKgigXio7oE4q-9AeK9hAXfvgPS: I also switched Point Shot with Kneecap Shot - just made more sense with our mobility, but leaving Gun Nut instead or Psycho-temporal Acceleration for +5AP can also work I guess.