[Helix_FR]

Bill is correct. Nickel plating is used many times for beyond just a nice looking finish. It has its own performance enhancing capabilities such as a slicker finish for easier operation (like the mini 14 mags) Its does add a level of thickness. Such as if you have a pin that is loose in a receiver or loose to the component that it relies on, nickle plating it will add a very minimal thickness to it but just enough to add some tension.