The Primary Arms SLx MD-25 Gen II Red Dot Sight (part number 810032, SKU PA-SLX-MD-25-G2) is a 25 mm tube-style red dot sight with a 2 MOA red dot, a rotary brightness knob, and AutoLive motion sensing giving over 50,000 hours from a CR2032 cell. It adjusts in 1/2 MOA clicks, has 11 brightness settings of which two are night-vision compatible, uses fully multi-coated glass, weighs 6.5 oz (184 g), measures 3 in (76 mm), and is built on the Aimpoint Micro footprint.
Two things make this the practical choice. The rotary knob gives positive detents you can find with gloves on and a definite off position, which push buttons never quite manage. And the box covers every mounting height you are likely to want: a low base, a standard riser and two spacers combine to give optical centre heights of 0.96 in (24 mm), 1.41 in (36 mm), 1.54 in (39 mm) or 1.64 in (42 mm), so you can set absolute co-witness, lower third or a heads-up height without buying anything else.
Because it uses the Aimpoint Micro footprint, the enormous existing range of T1 and T2 pattern mounts fits it directly.
How It Compares
This is the tube-style sight with knob controls. For a smaller 21 mm body with side push buttons, see the SLx MD-21 2 MOA red dot sight or, with a ring-and-dot reticle, the SLx MD-21 with the ACSS-CQB reticle. For a Solar Failsafe panel, the GLx MD-21S 2 MOA red dot sight is the duty-grade option. If a red dot looks smeared to you, the glass-etched reticles in the Primary Arms prism scope range will suit your eyes better. Browse all rifle dot sights and red dot sights, and read our mount height chart and battery chart.
Ideal For
- Civilian Service Rifle and practical rifle, where a definite off position and gloved adjustment matter
- Straight-pull AR-platform rifles in Great Britain — four mount heights cover any receiver
- Practical shotgun and 3-Gun, where a tube sight's rugged form suits heavy recoil
- Night fox and vermin control, using the two night-vision-compatible settings
Key Features
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Reticle: 2 MOA red dot, covering approximately 2 inches at 100 yards
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Controls: Rotary brightness knob with positive detents and a definite off position, usable with gloves
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Illumination: 11 brightness settings, two of them night-vision compatible
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Battery: CR2032, over 50,000 hours with AutoLive motion sensing
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Turrets: 1/2 MOA per click
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Footprint: Aimpoint Micro, so standard T1 and T2 pattern mounts fit
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Mount heights: 0.96 in (24 mm), 1.41 in (36 mm), 1.54 in (39 mm) and 1.64 in (42 mm), all achievable from the included base, riser and two spacers
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Glass: Fully multi-coated
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Body: Hardcoat anodised aluminium, 6.5 oz (184 g)
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Warranty: Primary Arms Lifetime Warranty
Technical Specifications
| Product Type |
Tube-style red dot sight, 25 mm |
| Magnification |
1x, unmagnified |
| Reticle |
2 MOA red dot |
| Illumination |
11 settings including 2 night-vision compatible, rotary knob control |
| Battery |
CR2032, over 50,000 hours with AutoLive |
| Click Value |
1/2 MOA per click |
| Glass |
Fully multi-coated |
| Mount |
Aimpoint Micro / standard microdot footprint |
| Mount Heights |
0.96 in (24 mm), 1.41 in (36 mm), 1.54 in (39 mm), 1.64 in (42 mm) — all included |
| Length / Weight |
3 in (76 mm) / 6.5 oz (184 g) |
| Housing |
Hardcoat anodised aluminium |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-SLX-MD-25-G2 / 810032 / 818500018292 |
What's Included
- Primary Arms SLx MD-25 Gen II red dot sight
- Low base, riser and two spacers
- CR2032 battery, tools and manual
Warranty
Covered by the Primary Arms Lifetime Warranty.
UK Delivery & Support
This red dot sight is UK-stocked and dispatched tracked from our UK warehouse — no import duties and no customs delays — backed by UK-based aftersales support and the Primary Arms Lifetime Warranty.
Frequently Asked Questions
Will Aimpoint Micro mounts fit the Primary Arms SLx MD-25 Gen II?
Yes. The SLx MD-25 Gen II uses the standard Aimpoint Micro footprint, so T1 and T2 pattern mounts fit it directly.
What mount heights come with the SLx MD-25 Gen II?
The included low base, riser and two spacers combine to give optical centre heights of 0.96 inches, 1.41 inches, 1.54 inches and 1.64 inches, which covers absolute co-witness, lower third and heads-up positions without buying anything extra.
How long does the battery last?
The Primary Arms SLx MD-25 Gen II runs for over 50,000 hours on a single CR2032 cell with AutoLive motion sensing, which shuts the dot down when the rifle is still.
Why choose a rotary knob over push buttons?
A rotary knob gives positive detents that can be found and counted with gloves on, and a definite off position, whereas push-button controls require cycling through settings and give less tactile feedback.
What does 2 MOA mean for the dot size?
A 2 MOA dot covers approximately 2 inches at 100 yards, or about 5.8 centimetres at 100 metres, which is small enough for precise shooting while still being quick to pick up.
Is the SLx MD-25 Gen II night-vision compatible?
Yes. Two of the eleven brightness settings are night-vision compatible, so the dot can be used behind a night-vision device without washing out the image.
