This is a Red Star 20 round fixed SKS magazine that fits the Norinco SKS. It has been function tested only, and worked perfectly. I then took it off the gun, properly cleaned it and packed it away and forgot about it.
These have not been imported since 1994 and are hard to find. This will replace the fixed 10 round magazine on your Norinco SKS and give you 20 rounds instead of 10. Since there are some manufacturing tolerance variables among the Norinco SKS's, some may require slight tweaking to fit to your gun. This does not usually require a gunsmith.
If you want more firepower, and you've already learned that the Tapco mags won't work in your fixed magazine SKS...this is the mag you need.