Originally Posted by Omega!
Translucent plastics and fake brass exponentially increase the cost of manufacture, so a lot of companies just take the flat black shell and slap the internals in, as opposed to having the internals fit inside fake rounds that fit inside a mag. I think it's mostly a cost thing.
Agreed. I suspect this is the case more than legal reasons. You may still get TMs with the clear mags and fake bullets, but all the cloners will go with black mags and no bullets to cut costs.