I've done two dominating runs with more or less this AR/armor/crafting/temporal manipulation build -
https://underrail.info/build/?HgkDAwoMAwbCoG0AAAAAAGVsAADCoMKgV2NsAAAARgAAditjTzsmFcKHSghJKjFLJ1XCtcKkDsOMwq3in6IF4qe0Ct-_The really good feats are Full Auto, Concentrated Fire, Commando, Psycho-temporal Acceleration, Thick Skull, and Premeditation. The rest can probably be played around with especially on lower difficulties.
Dabbling in psi for temporal manipulation is really good, since Psycho-temporal Contraction (with Psycho-temporal Acceleration) and adrenaline gets you to 90 AP per turn, which is enough to burst three times with nine bullets each with a 7.62 Rapid Muzzled Hornet. Other gun should be a slower one for Commando procs, I like 9 mm Scoped Muzzled Chimera with the crit damage increase (green) scope.
Other gear, once you can craft it, should be Seeker Night Vision Goggles, Regenerative Tungsten Plate, tungsten boots with springs and high density foam, and a shield generator with the High Efficiency Energy Converter part.