I've had this savage fcp-k 10 223 for 10+ years and it shoots lights out. I've had a cheap athlon argos scope on it and wanted to upgrade the glass. I was using nightforce 30mm titanium rings. I purchased a Sig tango 6 3-18 on here and some 34mm vortex (seekins rings) on here which arrived today. Go to mount the rings and they don't fit on my rail. Is it simply because this is a weaver style and I need picatinny? Are rails universal or do I need something specific for my rifle? Pics are of the old rings and new ones by the rail.