Re: Straight pull AR
Back to the OP's original question,while there are places in the US where there are restrictions on centerfire semiautos, the restriction pertain to evil feature like pistol grips, flash suppressors, magazine capacity and detachable magazines, not to semiauto function per se. So there isn't much interest in non-semiauto ARs here.
In a ban state, I suspect building one of these with a combination of features otherwise satisfying the definition of an an assault rifle could lead to a test case, which would be won, given proper representation, but would be a major trauma for the victim.
In free states, the attitude would be "what's the point?".
JonA, is that a repeater or semiauto? And whose handguard is that?