So there seems to be quite a bit of confusion on this matter, even on this board.
To summarize, if you use any magazine larger than 10 rounds, and you have not done some major work (essentially a full conversion + some oher stuff) on your Saiga "sport" gun, you are in violation of 922R, regardless of the source of the extra large magazine.
An excellent explanation (should be MUST reading for alll Saiga owners) can be found here:
http://home.comcast..../home/922r.html
I ordered a set of 4 Bulgarian 30 round magazines "just to have" for $60, but unless I do a full conversion, I gues