That is damage, not wear. An idle, modern spring does not wear at an appreciable rate, loaded or unloaded.Just like springs on all vehicles, they all sit at constant tension. They wear when there is excessive weight on them for a period of time that they weren't designed to handle.
No, not unless you're going to strip the gun down with a degreaser and leave it bone dry, but wrt the recoil spring, it is not going to be hurt by storing the gun fully assembled. If you're going to store a gun for a long period of time, without periodic working/cleaning, it is best to grease it heavily and store it some place dry. Ever notice how a brand new gun is essentially caked with grease or thick oil? That is for the purpose of packing for long term storage, which is really the best way to preserve a firearm that you intend to put up for a while. Otherwise, clean/lube it normally and give it a light clean/lube ever so often, depending on the storage conditions. If damp then maybe every couple months, but if safe and dry upwards of six months with no use or exposure. Just depends on conditions.Just think that it might be good for the recoil spring.
Sent from my iPhone using Tapatalk