<P><B>Pistol
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<P>Pistol: It's the first ranged weapon you're likely to find. Useful until you get the stealth pistol.
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<P>Stealth Pistol: It does less damage, but the built-in silencer is great for silent, ranged takedowns.
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<P>Mini-Crossbow: This is a keeper. Using the tranquilizer darts takes some getting used to, but it's well worth it. Regular darts are also effective though only having four darts to a clip can make for some tense situations when you have to reload. Finally, the mini-crossbow is the only ranged weapon that you can fire underwater. If you don't have one, its either swim away or hack your target with a low-tech weapon.
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<P><B>Rifle:
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<P>Assault Rifle: Pretty much a no brainer. Alternate ammo even lets this little monster fire explosives. Add some weapon mods to knock down the recoil and a silencer, and you'll have fully automatic, silent death.
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<P>Sniper Rifle: Also a keeper if you have the room. You'll want to work on your breath control to minimize the bobbing of the scope when zoomed. Also, an added bonus of the master rifle skill is the ability to shatter cameras and turrets with the rifle. The silencer mod would even make this a good short-range weapon as well.
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<P>Assault Shotgun: Though you are likely to find the sawed-off shotgun first, drop it when you find one of these. It does a little less damage, but with 12 shots to a clip and a higher rate of fire, this beauty more than makes up for it. Switch to sabot rounds to chew up metal targets. I wouldn't recommend using this on security bots, but a few shots into a camera or turret will make quick work of it.