I would suspect lack of demand. Real SKSs can demand a premium due to scarcity and historical/collector value, but a newly manufactured one doesn't have that appeal and would be directly competing with AKs. Given the choice, I think most people would pick the AK with its reputation for incredible reliability and detachable 20-30+ round mags, especially considering I would suspect a low to mid tier AK to be cheaper than a newly built sks due to differences in manufacturing (milled vs stamped receivers) and economy of scale (a newly manufactured sks would probably be a pretty niche item so whoever made them probably wouldn't be able to sell enough to bring the cost per unit down to a reasonable price)
I've spoken with a lot of US shooters that would much prefer an SKS over an AK. Especially those that have had an opportunity to use one under stressful conditions and compare it to the other.
IMHO, there is enough of a demand to build a fully US made SKS to make it quite profitable, especially if one were produced in 5.56Nato, 6.5 Grendel, 7.62 Blackout etc.
I believe it's a niche market being completely overlooked, because of fear of the Chinese monster factories being allowed to inundate the US markets with their warehouses full of surplus SKS rifles.
I've been hoping for a long time now that some US manufacturer would produce a civilian version of the SKS in 5.56Nato, so that I don't have to build one for myself.
All of those cheap Mini 14 and AR magazines will need to be put to some useful purpose and what better than to modify a beater SKS to accept them and shoot the ammo they were designed for.
Don't go pulling the excessive pressure on me either. They built AKs into 5.56Nato capable rifles by converting existing rifles and producing accompanying magazines.
All they did, was open the gas ports on the prototypes to blow off the excess gas/pressure on the return spring and piston. The receiver is plenty strong enough as a single shot.
Modern grades of steel would quickly overcome any other fears and with the modifications available today, those rifles would work almost as well as AR type rifles for a lot of competitive situations in Canada.
I guess I need to get in touch with Lever Arms and pick up a decent receiver and other parts to complete the rifle I want to build.
Bolt face and extractor, as well as a stronger recoil/return spring are going to be the biggest obstacles.
Fitting a removable magazine will be tricky as well. Otherwise, I can modify the existing magazine to accept and load the 5.56 rounds butttttt?