An improved firearm accessory mounting interface is herein disclosed. The interface can include one or more sets of first and second fasteners that interface through an elongated slot in a firearm in order to mount a firearm accessory to a firearm. The second fastener can be shaped and sized to clear the elongated slot and can, upon clearing the elongated slot, be pivoted to an oblique orientation relative to the elongated slot so that the second fastener cannot be retracted. The first fastener can continue to be turned thus drawing the first and second fasteners toward each other and locking the accessory to the firearm.