I know this is nearly a decade after initial, but I have some information not listed on the chart. I recently acquired a Chinese type 56 SKS. Facility stamp is not in the chart here but after some google-fu I found it is facility 946. Serial number is in the 1.5m range, it has the mid production barrel lug, the spike bayonet, the 2 piece gas tube, with the carrier with no lightening cut but still having the clip groove, the standard bolt, with the 2 side milled firing pin, and the milled trigger group. From what I've been able to figure after my reading I believe the manufacture year to be '70 or '71, but there seems to be a lot of grey area on that. Not sure if anyone will care, but why not submit it.