was ready to order my saiga 7.62x39 today, even called my FFL, but I found out in order for it to accept standard AK mags you have to drill a hole in the gun near the chamber and install something called a bullet guide. not sure how reliable that makes the rifle.
there is another method that involves no modification to the rifle, but you need to weld a feed ramp onto the mag and file off (grind off for me) a section of the mag catch.
need to do some research on if either of these will last in the long run.