I have a Norinco AK-47 sporter with a thumb hole stock. It is threaded for a muzzle break but i suspect that was done later on. Now here is what i want to know it is clear that is was at once an underfolder due to the holes on the side. I believe it is a slant cut reciever but i am not sure. I hate the thumb hole stock that it came with and have always wanted to change it out. I would like to add a underfolder stock on it. so i am curious how difficult would this be and how hard is it to find a chinese underfolder stock or any underfolder that will fit but i suspect it needs to be chinese considering their recievers seem to be thicker. I am a TIG welder and metal fabricator so if there is any modifications i need to do the gun i am more than willing to if its within my capability. Added some pictures incase it helps any of yall help me solve this problem thanks everyone and sorry for my lack of knowledge.