Greetings. I am new to this forum and am returning to shooting after 20 years so please excuse the lack of knowledge on my part. I am looking at a 581-6??? serial # Mini 30 Tactical at my LGS. It appears to be in very good condition to my untrained eye. What are some things I should look for when considering this used rifle, particularly any evidence of corrosion from the Eastern-Bloc ammo I have been reading about. Thank you for your input. I have already garnered a great deal of good information from this forum.