I can't help with the the first problem however, I can help withe the second one! I also had a problem with my new 10 round mags fitting. But one day I saw the vidio on how to make the MD 20 round drum fit and realized that I could do the same "filing" on the 10 round to make it fit. It worked!
Go to "YouTube-Fitting your saiga 12 MD-20 Drum" Watch nthe vidio, you'll figuair it out. Do a littlt at a time then try it each time. Good luck!!
Also on this forum check out "The right way to fit your drum!"
I just got my saga 12 shot gun. The main use is for protection, large game, small game! My question is: when do I use a choke, and which choke for which use, it's threaded? Any help would be appreciated. New Guy!