Receiver might not be the right word here,.. block maybe? anyways, someone should machine a part that breaks up or fills in gaps between the receiver and bottle, it'll look so much nicer. This part will also consist of a 3 quarter circle that slightly wraps part of the bottle. Something that can attach to the bottom of picattiny, of course this part will also have a picatinny built it to it as well to attach any accessories. Someone make it!