First off, I am an amateur, by now means up to the level of Bklyn C and M1lk, so I am not the guy to ask for definitive AK knowledge. That said, I did a screw build underfolder AK. Would have preferred rivets, but do not have the tooling or the funding for it. Parts kit came from ak-builder.com, polish underfolder with new headspaced barrel. Again, don't have the equipment to press a barrel. Their customer service was great, everything in the kit was great except the handguards, which did not match and were both in pretty bad shape. Build only took about 2 days at a constant but leisurely pace. Here is the result, and sorry to the traditionalists. Down the road I may try my hand at a red Tantal build with all classic furniture. By the way, if anyone is interested in building an underfolder, prepare yourself mentally. I debated moving to a free state to utilize the stock when it came time to fix it.