I recently tried a commercial Magpul stock on my Norinco and it wouldn't fit. The Norc buffer tube works fine but the exterior was so uneven that the Magpul would not fit. I examined the Norinco and found the inside of the stock had been scoured out until it fit. Typical Norinco - works fine, looks like hell. I replaced the tube and put on the Magpul. Just a little lipstick on the pig!