Instructions
Remove the magazine and chamber the rifle several times.
Open the bolt and look into the chamber to visually check to see if it is empty.
Stick a finger into the chamber to manually ensure there is no cartridge in there.
Stick your finger into the front of the muzzle. If it feels smooth the first inch or two into the barrel, the WASR does not have a threaded barrel. If you feel threads just inside the barrel and extending down the barrel for an inch, the barrel is threaded.