Rifles can have a pistol grip here as long as they have a fixed magazine. A pistol grip and a removable magazine make an "Assault" rifle as unbelievable as that may seem. Too many "evil" features.
I don't really know what to tell you. Although you may want to err on the side of caution.
If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen. ― Samuel Adams