Didn't have Mahovsky Metallife my pistol, my 1911 slide is Metallifed by Michigean Armaments back in the mid 80s. I put the slide on in 1987 and have never had a problem with it. Some of the AMT Stainless Steel frame parts have shown rust (Hammer, grip safety, since replaced) due to IWB carry in humid weather. This is my carry gun when I'm home. After shooting metallifed parts just require a wipe down. Barrel, slide and bushing is also Mag-na-ported and CT grips added.
CD