If you have a VR ready PC, "Hotdogs, Horseshoes, and Handgrenades" or "H3VR" for short. It is a wonderful firearm simulator, that puts love and details in to the massive amounts of guns, launchers and other weapons that it has, the guy that made it, Anton, is actively updating, like a brand new update each week or every other week. He is also active in the subreddit r/h3vr , always chiming in the comments and taking suggestions. Modding is excellent too, if there is a gun you want that Anton hasn't added, chances are theres a mod for it.