Welcome.
But, uh, dude, go to the MilSurp (Military Surplus) section and have a look around at the stickies and posts.
Use the search tool to do a search on these rifles (use advanced search and set the timeframe back a year or two) - lots of details and discussion. Member Smellie and others are seriously knowledgeable and you can find out a lot from their posts.
And check the Equipment Exchange (have to ask for access - see Rules/FAQ) in the Military Surplus Rifles section - plenty of current and past examples.
Also check out milsurps.com.