Use something decent and clean it once in awhile and you will be fine.
Personally, I prefer a light grease on the rails of steel and alloy framed pistols during most of the year. Frigid weather months is all synthetic oil/CLP's.
Personally, I prefer a light grease on the rails of steel and alloy framed pistols during most of the year. Frigid weather months is all synthetic oil/CLP's.