Welcome to the forums, visitor. A sniper game? I was thinking about making one of those a while back, but I never got around to it

Anyway, I would suggest looking into the GC store, where you'll find a variety of sniper rifles (and other firearms) by Errant AI for around $3.00 each.
Then I would recommend looking into
Fenix Mod, which will increase your game's performance, allow you to use melee attacks with your sniper rifles, and give your enemies Dark AI (They'll be smarter, and know how to navigate around walls and obsticles to find the player. They'll take cover from sniper fire, and so on). Fenix Mod is
free.
You can look into
Errant's new task force characters here (still a work in progress but will be available soon). And I would suggest looking at
Model Pack 38 here, which includes new shaders that will make your game look more up to date ("next-gen"). And don't forget to search the forum, fps-files, fps-free, and so on, for hundreds of
free models to use in your game. Hope this helps.
Kravenwolf