Was just wondering if anyone could tell me where some decent guns are for my char who is a lvl 4 sneak/gun/sniper...I already have the incinerator and the single shotgun..but was hoping to find a sniper rifle or a more powerful rifle for that matter..any additional tips or areas i should check out in a somewhat near vicinity as well would be great thanks!

PS. Where do i find the Ratslayer?

I've found that the Varmint rifle with a scope and silencer do wonders if you can sneak in close for the critical hit.

In no Vac, there is "That Gun", a 1h magmun, with ok stats, you can find it in the rocket locker. in the Dino.

Another weapon is "Lucky" in Prim, but you need 75 lockpik, in the bufalo thing!

In Novac, go into the Ranger's bungalow. In a locked footlocker on a shelf is Trail Carbine (need good sneak because he doesn't leave the room) ay 50 Lockpick if I remember correctly.

"That Gun" worked well till about level 8 or 9. I think I paid 850 caps or so for it. It was great for the ghouls nearby...

Broc Flower Cave. NW of Camp Searchlight.
Great weapon, I'm still using mine (among others) at lvl 27.