Unity Rifle Character Setup

I need a quick hand inside Unity: please attach and align a rifle to my existing character so it works smoothly in a first-person shooter view. The model, rig, and weapon are all ready to go—I just lack the time to configure the socket, parenting, and hand grips, test the pose, and confirm that the rifle tracks correctly with the camera and animations already in the project.
No extra effects, code, or new animations are required; I only want the weapon seated naturally in the character’s hands with proper orientation and scale. Once done, send back the updated scene or prefab so I can drop it straight into the game and hit Play.