I think this sounds like the original mausermags from the 70th and 80th.
THey have an awfully hard spring dont they?
I have one for sale on ebay rigth now.
Is it looking the same like this?
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1165522498
Regards HÃ?Â¥kan
http://www.vapensmedjan.com