I've considered it, but I don't think I'll ever actually go through with it. major reason being the quality of the kits used. the company that IMO makes the nicest kits is called CBRPS, and they have a few different options to choose from. however I have bought one of their kits before for a different style of rifle and even though they're sturdy when finished, they are clunky and noisy(metal flaps all over the place that don't have any kind of arresting hardware). second reason being muzzle blast and report. even though most shooting is done at a range with ears and eyes on, I would like the chance to use all of my guns for hunting or god forbid other tasks which are banned for topic here. bullpupping a x39 is a bad idea for both, especially if using cheap ammo with crappy propellants. 3rd, they make factory triggers worse and the SKS has a great trigger as far as misurp rifles go, a bullpup kit would completely ruin that. add the fact that cleaning would become a greater chore than it already is.