Way back circa 192, as a Corpsman stationed at PNH before my tenure with the Marines, I purchased a used medical vacuum system, started vacuum sealing all gun boxes and receipts from gun purchases, loose ammo, and gun parts plus guns I had no intention of shooting for a while. I'd oil the gun and seal it. Just recently took out a colt python 4" nickel that I sealed back in the late 80s. Mint condition. Every gun I own I have the box/paper/oem mags vacuum sealed. Got quite a collection. Circa 1986/87 I purchased a literal ton of Essex frames, slides and parts, enough to build 70 or 80. Still got loads of parts in factory mint condition.