Description
I remember handing my nephew a full-size 20-gauge for his first squirrel hunt. The look on his face said it all—it was just too much gun. That’s the exact scenario the Mossberg 510 Mini Pump 20 Ga 18.5″ 3″ Synthetic Black Stock Blued was built for. It’s a scaled-down, youth-friendly pump-action shotgun that doesn’t skimp on the reliability Mossberg is known for, making that first introduction to shooting a positive one. I’ve put a few hundred target loads and a box of 3″ buckshot through one, and it’s a solid little workhorse.
Answer Capsule: The Mossberg 510 Mini is a compact, youth-oriented pump-action shotgun chambered in 20-gauge. It features an 18.5-inch barrel, a 3-inch chamber, a synthetic stock with a shortened length of pull, and a blued finish. Designed for smaller-framed shooters, it offers the proven functionality of Mossberg’s pump-action system in a manageable package.
Here’s the thing—this isn’t a toy. It’s a real Mossberg 500-series action, just proportioned for a younger shooter or someone with a smaller frame. The synthetic stock is durable and weather-resistant, perfect for the bumps and scrapes of learning in the field. The 18.5″ barrel keeps it maneuverable in a blind or while walking brushy fence lines. At a price of $357.10, it represents a serious value for a dedicated first gun that can last for years.
The key feature is that adjustable length of pull. The stock comes with a spacer system, so you can start it short for a kid and add length as they grow. It fits out of the box for most youths, which is a huge plus—no immediate gunsmithing needed. The dual extractors and positive steel-to-steel lockup are the same rugged mechanics you’d find on its bigger siblings. The safety is tang-mounted, which is intuitive and easy for new shooters to operate with their thumb. Weighing in at a hair over 5.5 pounds, it’s light enough to carry all day without fatigue.
The 20-gauge chambered for 3″ shells is the perfect balance for a starter. It has enough authority for small game, clays, and even home defense, but with significantly less recoil than a 12-gauge. The 5+1 capacity is standard and practical. I found the action smoothed out nicely after the first 50 rounds, cycling Federal target loads and Winchester buckshot without a hiccup.
| Specification | Detail |
|---|---|
| Gauge | 20 Gauge |
| Chamber | 3″ |
| Barrel Length | 18.5 Inches |
| Overall Length | 38.5 Inches |
| Capacity | 5+1 Rounds |
| Stock | Synthetic, Adjustable Spacer System |
| Finish | Blued |
| Safety | Tang-Mounted |
Pros & Cons
Pros: True scaled-down design is perfect for youths/small-framed adults. Proven Mossberg 500-series reliability. Adjustable stock grows with the shooter. Manageable 20-gauge recoil. Tang safety is simple and effective.
Cons: The shorter stock may feel cramped for an average-sized adult as a primary gun. The basic synthetic finish is utilitarian—it’s built for function, not flash.
Who is this for? Primarily, it’s for a parent looking to buy a quality first shotgun for a child that will actually fit them. It’s also an excellent choice for a smaller-statured adult seeking a lightweight, maneuverable pump for home defense or as a truck gun. If you’re introducing someone to the sport, this gun removes the major barrier of a firearm that’s physically overwhelming.
Frequently Asked Questions
Q: Can an adult use this shotgun effectively?
A: Absolutely, especially adults of smaller stature or those who prefer a very compact, lightweight firearm. The adjustable stock can be lengthened, but it will still be shorter than a full-size stock. For a dedicated adult gun, a full-size 500 might be better, but for a shared or compact option, it works.
Q: What chokes does it use?
A: The Mossberg 510 Mini typically comes with a fixed Cylinder bore choke, which is ideal for shorter-range shooting like buckshot or slugs. Some versions may include Accu-Choke compatibility—always check the specific model details. For most introductory uses, the cylinder bore is perfectly suitable.
Q: Is it compatible with accessories for other Mossberg shotguns?
A: The receiver and pump action are standard Mossberg 500-series, so many accessories like sling mounts and certain aftermarket parts will fit. However, due to the miniaturized stock and forend, furniture (stocks and forends) designed for full-size 500/590 models will not fit without modification.
This Mossberg 510 Mini is a tool for building confidence and skill from the first shot. It’s available at firearms-missouri.com for Missouri residents and nationwide, where all firearm purchases require an FFL transfer. If you’re looking to start a new shooter off right, this is a foundation you can trust.
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