I have a ReTro Valve, not an RT valve it says ReTro Valve on the valve system (just want to clarify because arent they the same thing?). Will a ULE trigger pull kit fit into the valve? I was reading that it might need to be custom milled to fit? Any help will do. Also, what type of hex wrench keys fight the automag? I have not shot this gun in probably 8 years but Im sure it still works. Its just been sitting in my closet and now i have the $$$ to custom it.