Almost every "best red dot" list on the internet is written to an American price. This one is written to what is actually on our shelves in Britain, in pounds, and the ceiling was chosen after looking at where the stock genuinely sits rather than by picking a round number. Across the 149 red dot sights and 53 green dot sights we currently hold, £300 is the line that separates a large, genuinely competitive group of working optics from the premium tier above it — and everything named below is a live product you can put in a basket today.
Why £300, and not £200 or £500
We pulled the price of every active sight in the catalogue before writing a word. The shape of the distribution decided the band, and it is worth showing you the numbers rather than asserting them.
| Price band | Red dot sights | Green dot sights | Share of the 199 sights |
|---|---|---|---|
| Under £200 | 7 | 3 | 5% |
| £200 to £250 | 14 | 4 | 9% |
| £250 to £300 | 7 | 4 | 6% |
| £300 to £400 | 22 | 21 | 22% |
| £400 to £700 | 37 | 17 | 27% |
| £700 and above | 62 | 4 | 33% |
Two things fall out of that. First, a "under £200" guide would be a very short article — ten sights in the whole catalogue, most of them the same two families in different reticle options. Second, the cumulative figure is the useful one: 39 sights, roughly one in five of everything we hold, come in under £300, and that group covers rifle and pistol, open and enclosed, red and green, single dot and circle-dot. It is a real shopping band, not a marketing one.
Prices move, and ours move with the exchange rate and with the manufacturers. Everything here was correct at the time of writing; the product page is always the authority, and we have deliberately not printed a price beside any product name below so this guide does not quietly go stale.
What you get for the money at this level
The honest summary is that the sub-£300 tier in 2026 buys you what £500 bought in 2018. Specifically:
- Multi-year battery life as standard. Shake-awake or motion-activation is now normal rather than a premium feature, and several of the sights in this band add a solar panel on top of it.
- Reticle choice. A single 2 MOA dot for precision, a 6 MOA dot for speed, or a switchable circle-dot — you are no longer forced to take whatever the budget model came with. Our red dot size chart covers what each covers downrange in millimetres.
- Proper mounting hardware in the box on most of the rifle sights, so there is no hidden second purchase before you can shoot.
- A usable warranty from a company that will still exist next year. That is the single biggest difference between this band and the sub-£100 sights sold on auction sites.
The sub-£300 sights we hold
Reticle and feature descriptions below come from each product's own specification, not from our impression of it.
| Sight | Best suited to | Reticle | Notable |
|---|---|---|---|
| Holosun ARO RD2 | Rifle | 2 MOA dot | The lowest-priced sight in the catalogue |
| Holosun ARO MRS | Rifle | Multi-Reticle System | Switchable circle-dot |
| Holosun ARO EVO | Rifle | 2 MOA dot | Solar Failsafe |
| Holosun ARO EVO SPR | Rifle | Special Purpose Reticle | Ranging marks under the dot |
| Holosun HS407C X2 | Pistol | 2 MOA dot | Solar Failsafe, RMR footprint |
| Holosun HS507C X2 | Pistol | Multi-Reticle System | The default UK pistol-footprint choice |
| Holosun HS507K X2 | Pistol, compact | Multi-Reticle System | RMSc footprint |
| Holosun HS407K X2 | Pistol, compact | 6 MOA dot | RMSc footprint, fast pickup |
| Holosun HS507C X3 | Pistol | Multi-Reticle System | Current-generation 507C |
| SIG Sauer ROMEO5 Gen II | Rifle | 2 MOA dot | Our deepest-stocked single line |
| SIG Sauer ROMEO5XDR Gen II | Rifle | Circle dot | Circle-dot at ROMEO5 money |
| SIG Sauer ROMEO-RS Pro | Pistol | Circle dot | Enclosed emitter |
| SIG Sauer ROMEO-RS Compact | Pistol, compact | Circle dot | Enclosed emitter, smaller body |
| Primary Arms SLx MD-21 | Rifle | ACSS CQB | AutoLive motion activation |
| Primary Arms GLx MD-21S | Rifle | ACSS CQB | Solar plus AutoLive |
| Primary Arms SLx RS-10R | Pistol | 3 MOA dot | RMR footprint mini reflex |
Green dot, same money
Green emitters used to carry a premium. They no longer do at this level: the Holosun ARO GR2, ARO MRS in green, SIG Sauer ROMEO5 Gen II green, Holosun HE407K X2 and HE507C X2 all sit inside this band. The human eye is more sensitive to green, so a green dot generally looks brighter at the same power draw and is often easier to see against woodland. Whether that matters to you is personal; our green vs red dot sights comparison sets out the trade-offs, including the one case where red still wins.
What you are actually giving up
Being specific about the compromises is more useful than pretending there are none.
- Housing material and glass coatings. The premium tier spends its money on forged housings and better coatings, which shows up as a cleaner dot and less tint. It is a real difference and it is visible side by side.
- Emitter quality with astigmatism. If dots starburst for you, a cheaper emitter tends to starburst more. That is a reason to consider a prism scope instead — see our astigmatism guide.
- Proven abuse tolerance. The reason a Trijicon RMR costs what it does is a decade of institutional service. If your sight is going on a hard-recoiling shotgun, read what actually survives recoil before deciding the budget.
- Adjustment travel and turret feel. Fine at this price, but not as crisp. Our MOA at distance chart explains how many clicks you should expect to need.
Mounting: budget for it separately
Rifle sights in this band generally ship with a Picatinny mount, but the height may not be the one you want. Absolute co-witness, lower 1/3 and 1.93 in all shoot differently, and the mount height chart and co-witness guide are worth ten minutes before you order. Pistol sights are footprint-dependent — RMR, RMSc and the rest — and our footprint compatibility chart exists precisely so that nobody buys the wrong one. If your rifle has an 11 mm dovetail rather than a Picatinny rail, read our 11 mm dovetail guide first, because none of these sights will clamp to it directly.
Frequently asked questions
Is a red dot under £300 good enough for real use?
For general shooting on a rifle or a pistol, yes. The sub-£300 tier now carries multi-year battery life, motion activation and reticle choice as standard. What the premium tier buys is housing strength, emitter quality and institutional service history, which matters most under heavy recoil or hard use.
Why does this guide stop at £300 rather than £200?
Because we counted. Only ten of the 199 red and green dot sights we hold come in under £200, and 39 come in under £300. £300 is where the catalogue actually has depth.
Do I need a licence to buy a red dot sight in the UK?
Sights are not firearms and are not entered on any certificate. The framework is explained in do you need a licence for a rifle scope, red dot or torch, along with what the law does regulate.
Can I use one of these for deer stalking?
That depends on your quarry, your ground and your certificate conditions rather than on the sight itself. We have written it up in can you use a red dot sight for deer stalking in the UK.
What dot size should I pick?
2 MOA for rifle and precision, 6 MOA for speed on a pistol, circle-dot if you want both. The coverage figures in metres are in our red dot size chart.
Browse the full range of red dot sights and green dot sights, or narrow it down to rifle dot sights and pistol dot sights. If you are building an AR, the AR-15 optics and straight-pull rifle optics collections are the place to start, and our guides to optics for a straight-pull AR and scopes for a .22LR rimfire go deeper by discipline. The same method is applied to magnified glass in best rifle scopes under £800 and to torches in best weapon lights under £250, and our older best budget red dot sights guide takes the same category from a different angle. Everything is held in our UK warehouse and dispatched tracked, with no import charges to follow — the detail is in buying optics in the UK.