Quoted:
More of an "evil feature" problem.
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No is a section 922(r) problem as Troy pointed out. Imported rifle are covered under a different (and more strict) set of rules then domestically produced rifles.
While a DOMESTIC produced SKS could have a bayonet (and a flash hider). However there is no domestic SKS production, and nobody makes enough US parts for the rifle to be considered 'domestic'.
Every wonder why people buy those 'US Parts' for their FALs and AKs - when surplus military parts are cheaper? Is so the rifles will be exempt from 922(r) and only subject to the '94 ban - which means they can use imported magazines AND have a pistol grip.
The only exception to the 'bayonet' rule are those rifles listed as a 'Curio/Relic'. The only SKS's I know covered under there are the Russian ones and the Yugo ones (recently imported). Ironically if you have a C&R FFL you can buy a bayonet equiped Yugo SKS from an importer - but you could not buy a neutered Chinees SKS on your FFL. Yet they are pretty much the same rifle - strange but true.