''A lawsuit was filed the very next day to enjoin the village from enforcing that law,'' notes Morton Grove's Corporation Counsel, Martin Ashman. The plaintiff, Victor D. Quilici, a lawyer who lives in the village, charges that the ordinances violate the Federal and State Constitutions. Both the National Rifle Association in Washington, D.C., and the Second Amendment Foundation in Bellevue, Wash., are helping to pay for the lawsuit, Mr. Quilici says.