I've got a 90 round MGW snail drum for sale. I've shot about 100 rounds through it. A few handling scratches, but otherwise it's in great shape.
Will trade for a mount for a flattop that'll let an Aimpoint co-witness (like a LaRue M68, or something like that). Used is fine. Cantelever or not. Finish wear is fine. Just needs to function properly.