I have a threaded barrel Chinese SKS-M/D with a corroded chrome lined barrel. I was considering trying to thread on a Russian barrel. I read that a Yugo threaded barrel will end up with the Gas block upside down. I have not found any info on the russian barrels. They look the same but have not tried to remove them. I also think some machining of the barrel end is required due to the AK mag front tab cut out. Thought I would see if anyone has tried this.