Itguy - that's a good point and I suppose that yes, it could contribute somewhat to spring fatigue, but, if it helps to break the gun in then perhaps it is worth it? I suppose one could also cycle the slide without the spring just to 'mate' the parts together, especialy with the Flitz, and wear them in but for my money I would keep cycling the pistol as necessary and replace the spring after several hundred hand cycles + live firing - maybe 200 + 150 or something like that.