I always buy non-corrosive ammo when I can. Shot a Saiga 7.62x39 AK-47 semi-auto without cleaning it for years as an experiment(have more than one). The action started getting a little tight, so I just sprayed some Rem-oil in there, worked the action about twelve times, and shot it another few years. When the 2006 ones came in, I cleaned it...experiment over. Loose tolerances or whatever, it carried dirty and kept on ticking.