I have two of these and I think they are brilliant pistols. Great grips, sights and trigger. They are so adjustable. Don't screw or unscrew the cylinders in the fill adaptor under pressure as its aluminium thread on aluminium thread and they will gall very easily. When I fill my mine I screw the adaptor into the air tank then I screw the cylinder into the adaptor but stop just before the cylinder vents. Then fill to 200 bar and then vent the adaptor ( only use a surface use valve)