16-Oct-2026
The difference is in how the two barrels sit. On a side-by-side they lie next to each other, like a pair of binoculars. On an over-under, one barrel sits on top of the other. That one layout choice changes the sight picture, the way the gun feels in the hands, the choice of used guns on the market and, to some extent, the kind of shooting each is most often chosen for. Neither is “better”. Most shooters end up preferring one because it suits their eye, their build and their sport, and the only reliable way to know is to mount both.
This guide walks through the practical differences in plain terms, so you can decide what to try first. If you are looking at guns on Rightgun.uk, it should help you read the listings with more confidence.
What each layout actually is
Both are “double-barrelled” break-action shotguns. You open the gun on its hinge, load two cartridges, close it, and shoot. Each barrel has its own chamber, and most guns can fire either barrel in the order you choose, depending on the trigger set-up. Under the skin, a side-by-side and an over-under can use the same sort of lock work: you will find boxlocks and sidelocks in both camps, so the layout alone does not tell you how a gun is built or what it is worth.
The side-by-side is the older of the two designs in everyday British use, and it carries the look many people associate with traditional game shooting. The over-under became hugely popular through the twentieth century, especially in clay shooting, and is now just as familiar on a driven day as a side-by-side.
A good way to think about it is that the layout is a starting point, not a verdict. Barrel length, weight, stock shape, trigger type, and fit matter at least as much as whether the tubes are beside each other or stacked.
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The sight picture: What you see along the barrels
When you mount a gun and look along it, a side-by-side shows you a wide, flat plane between the barrels, often with a groove or rib running between them. An over-under shows you a single narrow rib, so the view is closer to looking along one barrel with a second tucked underneath.
Many shooters find the over-under’s narrower picture a little easier to line up and to keep quiet, which is one reason it suits those who like a very defined rib to look along. Others prefer the wider, flatter picture of a side-by-side and find it natural, particularly if they learnt with one. Both are used to very high standards at every level.
This is one of the clearest things you can only judge by trying. If you have never held both, a visit to a gun shop, a clay ground or a friendly shooting pal is time well spent. The right choice is usually the one where your eye settles on the target without effort.
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Handling, weight and balance
Because the barrels sit in a different arrangement, the two layouts tend to feel different in the hands. A side-by-side is generally slimmer from top to bottom, and many are built with light, lively handling in mind, which is why they have a following among walked-up and rough shooters who carry a gun for long periods. An over-under is often a little deeper in the action and tends to carry its weight in a different place, and a lot of shooters like the steadier, more settled swing that can result.
Those are tendencies, not rules. A heavy side-by-side exists, and so does a lightweight over-under. Barrel length and the maker’s design matter as much as the layout. If you are choosing between two particular guns, hold them both: mount them, swing them, and see which one you can point without thinking.
Fit is the big one. A gun that fits you will feel natural whichever way the barrels are arranged, and one that does not will be a struggle whatever it looks like. If you would like to read more about getting this right, our guide on shotgun fit is a good place to start.
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Triggers, safety and everyday use
Many traditional side-by-sides are fitted with two triggers, one for each barrel, and many over-unders come with a single trigger that can be set to choose which barrel fires first. Neither is a rule, because both kinds of guns are made with single and double triggers. If you are used to one, the other will take a little time to get comfortable with, so it is worth trying before you buy.
Both layouts are used on every sort of shoot day, and the safe-handling rules do not change: keep the gun open or broken when it is not being shot, keep the barrels pointed in a safe direction, and follow the shoot captain’s briefing. Leave the final word on how your gun is built, how it should be loaded, and which cartridges it takes to the maker’s manual and a qualified gunsmith. If you are weighing up a second-hand gun, a quick check by a gunsmith before you buy is cheap peace of mind.
For the tradition-minded, a side-by-side has a particular charm on a driven day. For the rough shooter, a light one is a pleasure to carry. For the clay shooter and the all-rounder, an over-under is a common choice. But plenty of shooters do all of this with whichever they prefer.
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Choice, cost and the used market
Both layouts are well represented on the used market, and that matters because plenty of shooters buy second-hand. There is a wide spread of guns in each camp, from straightforward working guns to fine, hand-built pieces from well-known British and European makers. The price of any particular gun depends on the maker, the model, its condition, its history and the demand for it, not on the layout alone, so compare like with like and avoid rules of thumb about which type is cheaper.
If you are new to shotguns, an over-under from a mainstream maker is a very common first purchase, partly because there is a large pool of them for sale and plenty of people who know them well. A side-by-side can be just as good a first gun if it fits and you like how it looks and handles. Look at condition, the bores, the way the gun closes, and that the fit is right for you, and ask the seller about its history and the proof marks.
Our buying guides on side-by-sides and over-unders give a good overview of what is out there, and the listings on Rightgun.uk let you compare guns from different sellers in one place.
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Which should you choose?
If you shoot mostly clays, or you want a single gun for a bit of everything, an over-under is a popular and sensible place to start. If you love a traditional game gun, enjoy a light gun for a day’s walking, or simply like the look and feel of a side-by-side, there is a huge amount to enjoy there too. Many shooters own one of each.
The best advice is the simplest: try before you buy. Mount a few guns, borrow one if you can, and spend a session at a clay ground with a coach, who can tell you quickly which suits your eye and build. If you are buying for game, ask your shoot what it prefers on cartridges and check the gun’s suitability for them with the maker.
Whichever you choose, shoot it well, look after it and enjoy it.
Frequently asked questions
Is an over-under or a side-by-side better for a beginner? Either can be. An over-under is the more common first choice because there are so many available, but the best beginner gun is the one that fits you. A coach or a gun shop can help you check.
Is a side-by-side or an over-under better for game shooting? Both are widely used on driven, walked-up, and rough shoots. Choose by fit, weight, and how it feels to carry and shoot, rather than by layout.
Are side-by-sides lighter than over-unders? Many are slimmer and lighter, but not all. Compare the weight of the specific guns you are considering.
Can I find both on Rightgun.uk? Yes. You can browse shotguns by maker and model, including side-by-sides and over-unders, and compare them from different UK sellers.
Ready to find your next gun?
Whether you lean towards a classic side-by-side or a modern over-under, you can browse shotguns from UK sellers on Rightgun.uk, compare makers and models side by side, and list your own gun when it is time to move on. If you have any questions about licensing, or a particular gun’s legal status, speak to a registered firearms dealer or the police firearms licensing department.
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Further reading: Best side-by-side shotguns UK by budget, Best over-under shotguns UK by budget, Shotgun fit, Beretta side-by-side shotguns compared and Buying your first shotgun
