I'm actually really let down by CZ letting themselves be spooked like this.
Even IF there was a 922r issue, they hold no liability selling the two as two separate items.
You are correct. The two issues are totally unrelated. HK, BT, any combloc country all make foreign weapons and also sell their stocks separately and other parts. As a matter of fact you can even buy CZ VZ 58 and 61 stocks and parts separately also.
So they are just giving us a line of BS as the airsoft guns licensed by CZ are the same externally, receivers, grip and stock as the firearms and if you want their stock will need to buy the air soft version. Licensed means they get $$$.