Where did you buy it?
Well, Thanks for saving my gun. I really appreciate.you can assume that anything before 1990, in military packaging, is corrosive.
That is made in 1972
What did you pay for it? On his website it loks like he only has corrosive primed 7.62x39 in stock.
Some say yes, some say no. I have shot a few hundred rounds out of a similar crate that was said to be non-corrosive, and I do not think it is corrosive. However, many people say if in doubt, treat it as corrosive.
I had the same stamped crate from lever, 30-72-31 and it's sometime corrosive. i had probably 400 or so rounds that were non corrosive, no rust, didn't get around to cleaning it for a while, no problems. then the last few hundreds rounds from the first spam can rusted anything it went through, so even doing the nail test won't tell you for sure. There is some corrosive that is mixed in, so except for testing every single round there's no way to be sure.
Occasionally, be sure to check every few days it if you're not going to clean it right, i now have a pitted gas tube, piston and gas port because i took it at face value, not a lesson i want to repeat.
I paid $375+Tax, it was about $395. I bought that on May when i was gonna get a CZ858. Check the following link.
http://www.thingsmilitary.com/ammunition/7.62x39-fmj-non-cor.-720rds-only-199.95/
Comes in yellow boxes too.