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Eezox comes to mind as a great one, but lately Breakfree has produced what they call a long term storage 'Collector' preservative, on the order of five years. Cosmoline still works fine too. The added bonus of getting this right is that it minimizes handling time and therefore chances to ding the gun up. Storage method is half the battle, keeping it in a dry steady environment and not in a moisture-collecting case is vital.