1. If you are putting a Saiga 7.62x39 in it, you will not have the sling mount hardware or a butt plate for it. The Kushnapup does not come with these. You are expected to salvage them from your original Saiga 12 stock, so if you didn't have a Saiga 12 or disposed of the original stock, you are SOL.
2. Any Saiga 7.62 magazine over 10 rounds will not fit. It will hit the trigger guard when you try to rock it forward. So get a couple of 10 round mags if you plan to get one of these.
3. Whether you put a Saiga 12 or a Saiga 7.62 in it, even though the website says that you don't need to modify the rifle, you will have to cut off the tangs for it to fit. Distribution was put off for over a year. You would think that the damn thing would have been designed to be 1.5 inches longer where it would encase the tangs.
4. If you do get one of these and you want to keep the tangs (so that you don't destroy the rifle), there is a solution. I went through many failed ideas, but I landed on one that is sturdy and looks acceptable. It is also on the rifle itself, so when you remoce the stock to clean your rifle, it will not disturb the recoil assembly.