I have a Mossberg model 510 youth or small adult 20 gauge pump. I bought it new last summer for my 9 year old grandaughter to start trap shooting. Through the winter she's outgrown it. It's had about 10 boxes of shells throught it and was meticulously cared for while she had it. The bbl is 18" with two beads, it comes three choke tubes, two recoil pads (one with a 1" spacer attached), and a cable lock. It does have 3" chamber and you can remove the magazine tube plug and up the capacity for hunting, etc. It's a great kids gun, solid, reliable and might also make a dandy little hallway howitzer. All original stuff is there, box, papers, manual, etc. $275 + shipping to your FFL.