The Mossberg 500 has been around since before Moses had to shave. The used market is loaded with good ones at reasonable prices. Mossberg offers many barrels and barrel kits making this an extremely versatile gun. The "system" pictured includes a bird gun (which works well enough for single shot clays. There are those who can shoot doubles with a pump, but I'm not one of them.), a small game/HD gun (18 inch barrel) and a large game gun (rifled slug barrel with zoom scope). The whole system was put together for ~$600.