SKS would work.
The problem with the SKS is it's cost, its a surplus rifle, even meh examples are around $400
Capacity is limited, and even good stripper clips are a PITA. Aftermarket detachable mags are a thing, but they all suck. Speaking of aftermarket, the SKS's aftermarket is pretty much tapco grade crap, and there are no good options for mounting an optic
As for caliber, 7.62x39 is heavy and underpowered. It's similar to .300blk, but blk has the benefit of being used in more suppressor friendly guns. In any case, even up close (within 200 yards) 5.56 out performs it, all while being near the same price (steel case vs steel case) and having far more loading options.
The SKS is also more complex and harder to take down. Have you see the nightmare of a FCG on the SKS?
Even compared to an A1, the SKS is so outclassed its crazy.