Early this year, a Facebook user in Baghdad using the name Hussein Mahyawi posted a photograph of a slightly worn M4 assault rifle he was offering for sale. Veterans of the latest war in Iraq immediately recognized it. It was a standard American carbine equipped with a holographic sight, a foregrip that was military-issue during the occupation and a sticker bearing a digital QR code used by American forces for inventory control. Except for one detail — an aftermarket... (GunPolicy.org)