Flossie,
FEDERAL law trumps state law.  
You CANNOT buy a gun from a licensed gun dealer with a misdemeanor crime of domestic violence.  If you mark "yes" on the Form 4473, the sale will be denied by the sales clerk.  If you lie on the form and mark "no", you will be denied and gov.org can prosecute you if they choose.  
In reality, BATF&E  goes after no one, but the "threat" of prosecution exists.  
If you are in possession of a firearm and you have a law enforcement "encounter" and you have a domestic violence conviction, you will be arrested.