Uncovering a Threaded Saiga Barrel

[Rekrab]

I was looking at my 7.62x39 Saiga a little closer while I was cleaning it and it looked like there might be threads underneath. Is there anyone who could show me what I'm looking for? Like a picture of a threaded barrel before it was uncovered?

My google-fu turned up nothing >.<

[Eleutheros]

http://forum.saiga-12.com/index.php?showtopic=48234&st=120

http://forum.saiga-12.com/index.php?showtopic=49347

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