Really no point upgrading the rails to metal. It’s a .22LR. You’re just going to make it front heavy and point weird for literally zero added benefit. Keep in mind the body of the gun is polymer... your custom machined rails will still be screwed into plastic lol
Before you get carried away with metal parts I suggest holding the gun. It really points so well being so light.
I have removed my rear sight and removed the front site post (not the outer ears) and that gives me a perfect sight picture with the red dot.