I normally advise against WD-40 on firearms as it turns to varnish and can stick things together that dont need to be stuck.
However, the number 1 best thing for removing WD-40 is WD-40.
Not saying your gun has had WD-40 used on it in the past, but it is a very good possibility. Once you get it un stuck then go with a better grade gun oil
PS ATF is automatic transmission fluid
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