Action: Pump – Gauge: 20 – Capacity: 4 – Chamber: 3 – Barrel Type: Vent Rib – Barrel Length: 18.5 – Sight: Dual Bead – Choke: Accu-Set – LOP Type: Adjustable – LOP: 10.5-11.5 – Barrel Finish: Blued – Stock Finish: Synthetic w/ Spacer – Weight: 5 – Length: 34.75 – Shell Size: 2.75 – When Mossberg set out to create a dedicated shotgun for youngsters and small-statured shooters we didnt just slap a smaller stock on our legendary 500 and call it good. Instead our engineers made everything smaller and created what is arguably the worlds smallest fully-functional pump-action shotgun. Available in either 20 gauge or .410 bore the Mini features an 18 1/2 vent-rib barrel with dual-bead sights. Parents dont have to worry about their young shooter growing out of this gun too quick the adjustable classic stock can be adjusted from 10 1/2 to 11 1/2 length of pull so the Mini can grow with your child. This adjustability also helps provide a proper fit for young shooters and allowing for a more safe and enjoyable shooting experience. Weighing in at 5 pounds and only 34 long the 510 Mini proves that big things do come in small packages!