I am about to drill my SKS for the side mount scope, I wanna see where you put your mount. As lined up , mine is all the way to the rear of the receiver (before trimming) to ensure stripperclip use as planned...., but I don't want to step on my dick
. Plus, I can't find a photo of a factory installed mount.
. Plus, I can't find a photo of a factory installed mount.

) it came out fine. I did use a drill press and vice holder while drilling. In the case of the Nagant, I was duplicating the historical configuration. Not sure what side mount you're trying to use on the SKS, is it the AK type? But before you drill your SKS receiver .... just know there are integral receiver-scope bases with see thru mount available and cheap (all one piece! just replace existing receiver cover), both top mount and side mount config's -If you're just looking to keep open sights working while the scope is on. The worst problem I had was to file the mounting bolts down a bit because they protruded into the receiver space, I had no nut (off metric size) to put on to first/ back off after - to clear the threads after filing to correct depth.
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