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from my experience with the sks the trigger group simply replaces the old.
On another note, it may be that your firing pin is too long, or worn and narrowed, and can be slamming into the next round. I recall this being a problem on some china models. If you do a search for SKS you might find more info.
I like the standard stock. The short ones my look cool but I did not like the feel. But that is really up to your tastes.
Good Luck!
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