Can we sue all the legislators for violating the oath of office??
Yes and no. Because of the separation of powers doctrine, any judicial relief in this type of situation would be limited to Petitioning the Delaware Supreme Court for a Writ of Mandamus directing the General Assembly to repeal the sections of Title 11 that are unconstitutional. There's a snowball's chance in hell of that happening if there is no opinion from the United States Supreme Court on the matter, however, I, and other nerdy legal 2A folks that I know have high hopes that SCOTUS will grant the Petition for Writ of Certiorari in the Bianchi v. Brown case from the Fourth Circuit, which believe it or not, is more anti-gun than the Third Circuit.