Picked up a Diablo AR1 and none of my loaders fit it. Hard to find a picture out there of the top of the old Diablo line, but I would assume a Wrath, Slayer, or possibly Mongoose feedneck will fit. AR1 uses the 2 screw narrow wing/tab feedneck, I believe a Spyder narrow wing/tab feedneck would fit as well. Anyone have one for sale? Thanks!