From my years of doing gunsmithing I found that WD-40 will gum up over time and will make normally free moving parts require solvents and force to free them up. This won't happen over a weekend or even a year, but eventually you'll have a big problem. I'll concede that just wiping down the barrel and receiver after a shooting session will likely do no harm, but refrain from using it on the internal mechanisms that don't get taken down and thoroughly cleaned often.
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