does it hurt

It should.:rolleyes: But it works better if you take it apart first.

Oh, you mean will it hurt the firearm? No, not at all.
 
I know a gentleman who had an unfortunate experience soaking a nickel plated S+W cyl in old formula #9
 
I know a gentleman who had an unfortunate experience soaking a nickel plated S+W cyl in old formula #9
Yup, don't soak a nickel gun. A thin coating of copper is often put over the steel so the nickel sticks better. If the gun has any nicks or scratches the #9 can get underneath the nickel and eat away the copper between the nickel and steel.
 
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