Not sure if this was at SHOT but here's an AC-556 inspired folding stock for the SKS. Honestly surprised someone read my mind here as I was thinking of converting an A-TM to SKS spec whether that meant opening the A-TM stock or using a damaged SKS stock to graft an A-TM folding mechanism on the back. Also comes in triangle folder flavor. He also claims to have an SKS FRT in progress FWIW. Maker is Hush Holsters. My only complaint is that the vent cuts are on the stock and the stockline seems a bit low. The Chinese SKSs do not have the vent cuts on the stock, only the handguard, at least on mine.
youtube.com/watch?v=CGX8mHdsyfI
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