Summary I used the Rail and Cylinder Sleeve piece made by 3dGringo, and created a new cap I feel is more accurate, and a curved piece that slides right onto the bottom of the shotgun cylinder onto the greeble perfectly. Paint the main body of the pistol satin black, grips were painted espresso colour, and touched up with black acryllic. Shotgun Cylinder and 3D printed parts were painted with aluminum coloured paint. Sleeve was attached by heating up the back section with a heat gun for about 1 min to make it flexible and snapping it into place. Parts affixed to the pistol using Crazy Glue.