A lot depends on whether you are buying ,selling or just argueing a point . A well restocked gun is preferable to a gun with a short stock or a stock that has been well worn or god forbid repaired . It has no real effect on the value as would having been rebarreled by another or having had other "modifications" or refinishing.There are of course the purists who would never buy a gun unless it is absolutly 100% original ,in its original packingetc . But then again thoses people never seem to buy any thing