MILWAUKEE (AP) – After the fatal shooting rampage at a suburban Milwaukee spa, two local lawmakers are trying to tighten enforcement of gun rules in domestic violence cases.   But it’s unlikely their proposed changes would have prevented 45-year-old Radcliffe Haughton from buying a handgun just two days after his estranged wife obtained a restraining order against him.   Police say Haughton used that gun to shoot seven women Sunday, killing his wife and two others, before fatally shooting himself.   But Democratic Sen. Lena Taylor says the shooting highlights the need for better enforcement of laws requiring that restraining order recipients surrender their weapons. She says standards are inconsistent.  Her legislation would require people with restraining orders against them to surrender their firearms within 48 hours or face arrest. The bill failed in 2010.