I've got several nickeled firearms, 3 M39's, M59, M34, Colt DS... The only one I have ever had a problem with, nickel wise is the Colt DS. I loaned it to a buddy to use in a high humidity/salt water environment. When I got it back the cylinder was fogged on four of the six chambers from sitting in a leather holster while on a sailboat in the Pacific Ocean. A little Flitz took care of the fogging and all is well. Now I use Renaissance wax to protect ALL of my firearms. As a general rule Nickel is more durable than blued and as long as the nickel finish has no penetrations through the finish it should look as good as it does now when handed down to your grand kids.

Class III