It would probably have to be Sniper Ghost Warrior 3. Bad game, poor reviews, overall considered to be a flop, but I still had a ton of fun with it and played the heck out of it a few years back. It would be hard for me to recommend it honestly, but if you could get it for free or super cheap and you’re looking for a sniper game where you don’t have to think about a story (since it’s bad and doesn’t really make much sense), I’d say it doesn’t hurt to try. I had a lot of fun with it, so maybe you could have fun with it too. If my very mediocre review has somehow convinced you to try it, I do believe it’s currently on sale on steam for a couple bucks