Mossberg SA-20 All Purpose Field 20 Ga Shotgun

Description

I remember the first time I took a new shooter out for clays. They were struggling with a heavy 12-gauge, flinching before every shot. I handed them my Mossberg SA-20, and the difference was instant. That’s the story of this gun. So, what is the Mossberg SA-20 All Purpose Field 20 Ga, 28″ Vented Rib Barrel, Black, 4rd? It’s a lightweight, gas-operated semi-auto shotgun built for comfort and reliability in the field or on the range. It’s designed to handle a wide variety of 2 ¾” and 3″ 20-gauge shells without beating you up, making it an ideal choice for upland hunting, waterfowl, or recreational shooting. At $475.16, it delivers Mossberg’s proven performance in a user-friendly package.

Here’s the thing—the SA-20 platform is Mossberg’s answer to the need for a soft-shooting, dependable autoloader that won’t break the bank. I’ve put hundreds of target loads and a fair share of heavier waterfowl rounds through this model, and its gas system really does eat up a lot of the recoil. That 28-inch vent-rib barrel isn’t just for looks; it gives you a clean, consistent sight plane for tracking birds or breaking clays. The black synthetic stock is durable, weather-resistant, and frankly, it fits out of the box for a wide range of shooters. The overall weight sits right around 6.75 pounds, which is a sweet spot for carrying all day without sacrificing swing dynamics.

Let’s talk about the action. The SA-20 uses a familiar, proven gas-operated system that’s easy to maintain. It cycles light target loads just as reliably as high-brass hunting loads, which is a huge plus for a do-it-all gun. The 4+1 capacity is perfect for most hunting regulations and practical for home defense scenarios, though you’ll need to source a plug for migratory bird hunting. The controls are classic Mossberg—tangible, simple, and easy to operate even with gloves on. The cross-bolt safety is right where your thumb expects it, and the bolt release is intuitive.

Specifications

Gauge	20 Gauge
Chamber	3″
Barrel Length	28″ Vented Rib
Overall Length	48.5″
Weight	Approx. 6.75 lbs
Capacity	4+1 Rounds
Finish	Matte Black
Stock	Black Synthetic

Pros: The low recoil is its biggest selling point, making it fantastic for new shooters or those sensitive to kick. It’s incredibly lightweight for carrying on long walks. The price point is very competitive for a reliable semi-auto. Maintenance is straightforward—disassembly doesn’t require any special tools.

Cons: The synthetic stock, while tough, feels a bit utilitarian compared to wood. The 4-round tube is standard, but some competitors offer slightly higher capacities. As with any semi-auto, it can be a bit more finicky with ultra-light target loads until it’s properly broken in.

So who is this gun for? It’s the perfect first semi-auto for a new hunter, especially a younger shooter or someone of smaller stature moving up from a .410. It’s a brilliant choice for the upland hunter covering miles for pheasant or grouse, where every ounce counts. It’s also a superb, low-cost option for a dedicated clays gun for casual sporting clays or skeet. And yes, it makes for a very manageable home defense shotgun—the 20-gauge with the right load is plenty effective and easier for other household members to handle.

Frequently Asked Questions

Q: Will it cycle light 7/8 oz or 1 oz target loads reliably?

A: After the initial 50-100 round break-in period with standard velocity loads, mine has run 1 oz loads without a hiccup. Very light 7/8 oz loads can sometimes be less reliable, so I’d stick with 1 oz or heavier for consistent function.

Q: Is the SA-20 compatible with aftermarket parts or chokes?

A: Yes. It uses the common and widely available Accu-Choke tube system (Mobilchoke threads), so you have a huge selection of chokes from brands like Carlson’s, Trulock, and Patternmaster. Stocks and forends are more limited than for a 500 or 590, but basic accessories are out there.

Q: How does it compare to a Stoeger M3020 or a Franchi Affinity?

A: The Stoeger is in a similar price bracket and is also inertia-driven, which some prefer for simplicity. The Franchi is a step up in fit and finish (and price). The Mossberg’s gas system gives it a perceived recoil advantage, especially for high-volume shooting, making it a fantastic value-focused option in the 20-gauge auto-loader space.

Look, if you need a versatile, soft-shooting 20-gauge that you can rely on without a second thought, the Mossberg SA-20 All Purpose Field is a solid bet. It’s available at firearms-missouri.com for Missouri residents and nationwide. An FFL transfer is required for firearm purchases, so get your local dealer’s info ready. See the full details on our site.