Scope for Air Arms S510xs Ultimate Sportster

The Air Arms S510xs Ultimate Sportster is one of the finest PCP air rifles available in the UK, blending a regulated sidelever action with a walnut stock and genuinely competition-grade accuracy. Choosing the right air rifle scope for it is not an afterthought — it is the single decision most likely to determine whether you shoot to the rifle's potential or leave performance on the table. Because this is a sub-12 ft/lb PCP operating within UK legal limits, your scope requirements differ significantly from centrefire shooting: you need clean optical clarity at modest magnification, precise parallax adjustment for short ranges, and a reticle that lets you hold or dial for pellet drop inside 50 yards.

The S510xs produces virtually zero recoil. That is a huge advantage when selecting optics, because unlike choosing a scope for a springer air rifle, you are not limited by the need for a double-recoil-rated scope. This opens the entire market to you, from premium FFP rifle scope designs originally built for rimfire benchrest to compact SFP hunting optics with generous eye relief. The key is matching the scope to your discipline — whether that is HFT competition, informal plinking, or serious pest control on permission.

UK shooters frequently ask us what the best scope for a PCP air rifle is, and the honest answer is that it depends on how you shoot. A 4-16×44 with a fine mil-dot reticle is the workhorse choice, delivering enough magnification for 50-yard target shooting while remaining usable at 10 yards on a field target course. A 6-24×50 gives you more resolution at distance but adds weight and length to an already well-balanced rifle, which can spoil the handling the Sportster is known for. We will explore these trade-offs in detail below.

Throughout this guide we reference real optical specifications — focal plane, adjustment granularity in MOA or MRAD, parallax range, and field of view — so you can make an informed decision rather than relying on marketing claims. All recommendations assume the UK legal-limit sub-12 ft/lb configuration of the S510xs and typical UK shooting scenarios: garden-length zeroing, permission-based pest control out to roughly 45 yards, and club-level HFT or field target competition. Let us get into the detail.

Buying Advice

Start with the numbers that actually matter. Parallax adjustment range is arguably the most important spec for an air rifle scope because pellet trajectories are steep and engagement distances are short. A scope with a minimum parallax setting of 10 yards (or less) lets you eliminate parallax error on close HFT targets, whereas a centrefire scope bottoming out at 50 yards will show obvious image shift at 15 yards. Look for a side-focus parallax wheel marked down to at least 10 yards. Adjustment granularity matters too: if you choose MRAD, 0.1 mil clicks move your point of impact 1 cm at 100 metres (roughly 0.5 cm at 50 yards). If you prefer MOA, 1⁄4 MOA clicks give you approximately 0.26 inches at 100 yards — fine enough for precise zeroing at airgun distances. Neither system is inherently superior; pick whichever you find more intuitive.

Budget tiers in the UK air rifle scope market break down fairly cleanly. Entry-level optics in the £80–£150 range deliver usable glass and basic turrets, but coatings and mechanical consistency can be hit-or-miss. Mid-range scopes between £150 and £350 are the sweet spot for most S510xs owners: you get fully multi-coated lenses, reliable tracking, side parallax, and often an illuminated reticle. Premium optics above £350 — and sometimes well above £500 — offer demonstrably better edge-to-edge sharpness, tighter manufacturing tolerances, and features like zero-stop turrets or FFP reticles. For a rifle of the Sportster's calibre, we generally recommend at least a mid-range scope to avoid being the weak link in the system.

Common mistakes UK buyers make include over-magnifying, ignoring eye relief, and confusing focal planes. A 10-50×60 target scope sounds impressive, but at 50× the field of view is so narrow that acquiring targets in a hunting scenario is painfully slow, and mirage at UK airgun distances can render the image useless on warm days. Eye relief below 75 mm is rarely a problem on a recoilless PCP, but if you also own a springer air rifle and want to share the scope, ensure it can survive the violent forward-then-backward lurch of a spring-piston powerplant — most standard rifle scopes cannot. On focal planes: an FFP reticle scales with magnification, so your holdover marks remain accurate at every power setting, which is excellent for HFT. An SFP reticle is only dimensionally correct at one magnification (usually the highest), but it stays visually clean at low power — ideal for pest control where speed matters.

UK-specific context shapes your choice more than you might expect. Under current law, no licence is required for a sub-12 ft/lb air rifle in England and Wales (Scotland requires an air weapon certificate). The S510xs in .177 or .22 calibre at legal limit is effective to around 45–50 yards on live quarry, so there is no need for a scope designed to dial hundreds of yards of elevation. Retailers such as Uttings, John Rothery, Solware, and Pellpax stock a wide selection, and buying from a UK dealer means your warranty is straightforward. Keep in mind that thermal scope options exist for night-time pest control, but they are a specialist add-on rather than a primary sighting solution, and they represent a significant additional investment.

Matching the scope to your use case is the final and most important step. If you shoot HFT or field target, prioritise a fine reticle (mil-dot or dedicated FT reticle), an FFP design or a well-marked SFP turret, and parallax focus down to 7–10 yards for close-lane targets. If pest control is your primary discipline, a slightly lower magnification range (3-12× or 4-16×) with a wider field of view and an illuminated reticle for dawn and dusk work will serve you better. For backyard plinking and informal target shooting, almost any decently reviewed scope in the mid-range bracket will deliver satisfaction — just ensure parallax adjustment goes low enough. Whatever you choose, mount it in quality one-piece or two-piece mounts appropriate for the S510xs dovetail rail, and invest ten minutes in proper scope-levelling before you zero. A perfectly good scope on a canted mount will frustrate you at every distance beyond your zero.