Okay, since hi-cap mags for unmodified IZ-240s seem to be the Holy Grail, and because I already have plenty of AK-74 mags kicking around, I decided to bite the...uh...bullet guide and install one in my Saiga.
I bought the complete kit from Dinzag, drilled, tapped, etc. No problems. But I can't start the screw to actually install the BG.
I tried the supplied screw plus a 6/32 that I had on hand. No dice. They just behave like the screw is too large for the hole. I've run the tap through many times, right until it bottoms out against the receiver.