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... (Budget: ₹600 - ₹1500 INR, Jobs: 3D Animation, 3D Game Art, 3D Modelling, Animation, C# Programming, Game Design, Game Development, Unity, Unity 3D)