This "Pumkin Puncher" is an extremely effective device that will give you a standoff / breaching option as well as an aggressive, non-lethal deterrent at an affordable price, by simply attaching to the mag cap of your Mossberg Shockwave 20 GA. This device is machined from 6061 T6 aluminum, and as such, machining marks may be present on some items. They are anodized flat black and laser etched with our brand. Each unit will come with all assembly hardware, all you'll need is a phillips screwdriver.