My understanding is that the Protection of Lawful Commerce in Arms Act does not apply as they are alleging that the Marketing was improper, as it was aimed at glorifying the death of humans, an illegal act.
It does apply, and you can read it at 15 USC 105. I already covered this in post 28.
They are claiming the SemiAuto Bushmaster is a military weapon, and should not be sold or marketed to civilians. The problems with this 1) There is nothing wrong or illegal about selling or marketing military firearms to civilians, just about everybody has a Glock 17, designed for the Austrian military. 2) A SemiAuto Bushmaster is not a military weapon.