Alpha trooper mods

My sister is getting into nerfing and I wanted her to do a real mod, so I pulled up pics of nerf blasters and she liked the EAT. I figured this was a wise choice but when I looked on omw they didn't have the kit and I heard the blaster parts kit screws up your plastic. Please let me know if you have any other good kits in mind. Thanks

P.S. I would just use a random mod and make it a beast but for her I want the simplicity of a kit.