there are close to 150 chinese factory codes, below are a small portion of codes i have seen.
please check your Chinese SKS and see if your factory code is on this list , if not, would you kindly post a close up pic of the factory code, the serial numbers (you may block off the last couple of digits) and the area where the barrel meet the receiver (barrel lug) so i may update the table ... thanks
A. Triangle factory codes:
B. Square factory codes:
1.[0129],[0134],[0138],[0140],[0141],[0144],[0147].
2.[0221],[0223],[0224],[0306],[6615].
C. Oblong factory codes:
1.(874),(974),(9186),(9696).
D. Diamond codes:
<0216>
E. Plain codes:
M8, M21 No, M21 0296, 416M21, DB, DP.
please check your Chinese SKS and see if your factory code is on this list , if not, would you kindly post a close up pic of the factory code, the serial numbers (you may block off the last couple of digits) and the area where the barrel meet the receiver (barrel lug) so i may update the table ... thanks
A. Triangle factory codes:

B. Square factory codes:
1.[0129],[0134],[0138],[0140],[0141],[0144],[0147].
2.[0221],[0223],[0224],[0306],[6615].
C. Oblong factory codes:
1.(874),(974),(9186),(9696).
D. Diamond codes:
<0216>
E. Plain codes:
M8, M21 No, M21 0296, 416M21, DB, DP.
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