https://cdn11.bigcommerce.com/s-lpuqsi1cy6/images/stencil/12...
Additionally, this is _also_ considered a pistol with a "stabilizing brace" (which are subject of much contention and confusion)
https://www.sb-tactical.com/wp-content/uploads/sbpdw-install...
The GP's complaint is that the linked photo contains insufficient context (for us, at least) to determine if the firearm in question is, from a legal standpoint, an SBR.