In the game, you can find the objects in buy mode under Entertainment / Hobbies & Skills. You need to install the WeaponsLib package plus the weapon object packages you would like to use. Desecrate-XanKriegor_Pistol - Pistol object, cloned from Glock 17 mesh by XanKriegor.Desecrate-XanKriegor_SniperRifle - Long Range Rifle object, cloned from Barrett M82 mesh by XanKriegor.Desecrate_WeaponsLib - Main script library for weapons objects, supporting a wide range of weapon types - requires base patch level 1.38 or above.It supports long range rifles, so you can use the full zoom to snipe out distant targets. It uses the WA camera interface to aim, but instead of taking a picture, it can kill the Sim in the scope.
This mod allows the use of firearms that can you can aim and shoot, killing your least favourite Sims.