are the norinco m93 barrels removable?

[m-134]

does anyone know if i pop the pin out from under the barrel i can just unscrew it? and does anyone know if it has the same threads/size as a colt woodsman barrel?
Im intrested in getting a longer barrel for it.

 

[polizeifritz]

I don't think it is brazed in there. Looking at mine, it looks as if you just need to tap out the pin and unscrew. Much like an old revolver