Hello guys, I have a question regarding the Norinco Mak-90, the Chinese copy of the Russan Ak-47!(type-56 in china)

My question is: How many does shots does it take for a Mak-90 or type 56 to lose its inital accuracy? For example, the Norinco SKS (very popular in the US) start to lose its inital accuracy after around 10000 shots fired, after 10000 shots the effective range decrease compare to a newer SKS.

Please answer my question and provide source!

thank you very much guys