Here's a 6 AGI sprint + strafe build
https://underrail.info/build/?HgUGBgMQAwfCoAA8AAAAAMKgS1AAemRaNhpkAAAARgAAQSsBOX8nAlN-M8KFSzUqwocWwrXCpDHfvA5 STR for all sniper rifles except black arrow
6 DEX for trap expert to lay traps faster. Mostly QoL but it helps against patroling enemies
6 AGI for sprint and strafe, also gives bonus to stealth
3 CON because I will be stealthed 90% of the time
18 PER because it's a main stat
3 WIL because it's a TM build and 70 points in it is more than enough for me
7 INT for crafting and gun nut feat
Main idea is to lay lots of traps, including bear and incendiary ones to proc opportunist and ambush, then shoot someone to get attention (if they're not in a bright tile then I'll use snipe of aimed shot). Then run behind cover and waith for enemies to get trapped, then walk in thei line of sight and start shooting. Repeat untill everything is dead. Also I'll use snipe for enemies who can't be critted or recieve lower crit damage.
This build is based around idea that I can reliebly move and shot to abuse line of sight and traps, but I don't want to spend hours to find out that it doesn't work as I wanted.
Also what's better, taking snipe and forget about crit damage feats to have more feats to spare, or taking sharpshooter and ambush?