If you are looking at one of those kits available from Center Fire Systems - the description stating the barrels are threaded on the chamber end is inaccurate. If you are familiar with chinese AKs, all of their barrels have machining marks along the length from when they were originally turned down to their final diameter - these machining marks are what the description is calling "threaded". They are a complete matching SN# parts kit from a stamped rifle, minus the trunnions, receiver and trigger guard. All the parts were in excellent condition.
The only part you will have trouble locating would be a 19mm front chinese trunnion, I found some, but they were over $100 each, just as much as the rest of the parts kit. I just picked up a NIB MAK 90 instead. Global Trades doesn't have any 19mm euro-conversion trunnions available and doesn't expect to for at least 6 months.