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When I played it, I went more for a stealth type build, so I often attacked with either a sniper or a shotgun for close combat.

Hmmm... I might try that out. The only sniper rifle I've found so far is way out of my level range. I've found that stealth pistols are a bit weak...

Snipers are a bit tricky to come by. IIRC, once you help Panam with a few things, she gives you a pretty decent one. You could also try your hand at crafting your own!