How can I tell the difference if I'm looking at used mini 30's? How do I avoid that inaccurate designs?
A couple ways. The newer Mini-30 is not available in blue/wood configuration, and has a newer front site, rounded receiver edges, and has serial numbers starting with “581”. The 580 is the newer Mini-14. Ruger did a major retooling in 2006, and these changes reflect the newer design, along with better construction tolerances. Accuracy is suppose to be significantly better, and I believe this to be so.
Apparently all the used iron you are seeing is from shooters upgrading their guns.