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!