Arsenal 636. From what I’ve read 636 is one of the preferred arsenals ( after 26 ). And that is the exact same website i used to date mine.Still shaking my head over the complete lack of import marks. It’s essentially the same as it came out of the factory. Weird.
CC
then again, it could have come in a conex labeled Tractor Parts... 8^)also, and i cannot recommend this enough, pls watch this video
i had them redo my bolt and their work is first rate and and you get what you pay for at a fair price
https://murraysguns.com/sks-firing-pins/