The Primary Arms SLx 1-10x28 LPVO Rifle Scope (part number 610156, SKU PA-SLX-1-10X28S-GRIF-M10S) is a 1-10x magnification, 28 mm objective low-power variable optic built on a 34 mm one-piece 6061-T6 aluminium tube, with a second focal plane (SFP) ACSS Griffin M10S reticle and red night-vision-compatible illumination. It adjusts in 0.5 MOA clicks, offers 40 MOA of windage and elevation travel, and runs from a single CR2032 cell across 11 settings, two of which are night-vision compatible.
A ten-times zoom ratio is what separates this from a conventional 1-6x. At the bottom it is still a true 1x for close work; at the top it reaches 10x, which is enough to identify a target and place a precise shot at distances where a 6x scope leaves you guessing. The ACSS Griffin M10S reticle was designed specifically for 1-10x second-focal-plane optics, with a bold horseshoe and chevron for speed up close and a MIL grid with ranging stadia for work at magnification.
How It Compares
This is the widest zoom range in our Primary Arms SLx line-up and it uses a 34 mm tube, so it needs a 34 mm mount — the Primary Arms SLx 34 mm cantilever mount is the matching part. For a lighter, shorter 1-6x on a 30 mm tube, see the SLx 1-6x24 Gen IV with the ACSS Nova reticle. For a first-focal-plane 1-8x with premium glass, look at the PLxC 1-8x24 FFP with the ACSS Griffin MIL G2 reticle. Browse the Primary Arms LPVO range, all LPVO rifle scopes and optics for straight-pull rifles, and read our guides to the best LPVO rifle scopes and the ACSS reticle system.
Ideal For
- Civilian Service Rifle and practical rifle where target identification at distance matters
- Straight-pull AR-platform rifles asked to cover close stages and long plates in one match
- Deer stalking, where 10x supports identification and shot placement without a second optic
- Night fox and vermin control, using the two night-vision-compatible illumination settings
Key Features
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Magnification: True 1-10x — unmagnified at the bottom for both-eyes-open shooting, 10x at the top for target identification
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Reticle: ACSS Griffin M10S, second focal plane, designed specifically for 1-10x SFP optics, with a bold horseshoe and chevron plus a MIL grid and ranging stadia
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Illumination: Red, 11 brightness settings of which two are night-vision compatible, powered by one CR2032 cell
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Turrets: 0.5 MOA per click, 40 MOA of windage and elevation travel
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Tube: 34 mm one-piece 6061-T6 aluminium, requiring 34 mm rings or a 34 mm cantilever mount
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Handling: Integrated magnification lever for fast power changes
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Warranty: Primary Arms Lifetime Warranty
Technical Specifications
| Magnification / Objective |
1-10x magnification, 28 mm objective |
| Focal Plane |
Second focal plane (SFP) |
| Reticle |
ACSS Griffin M10S, red illuminated |
| Illumination |
Red, 11 settings including 2 night-vision-compatible settings |
| Tube Diameter |
34 mm, one-piece 6061-T6 aluminium |
| Click Value |
0.5 MOA per click |
| Adjustment Range |
40 MOA windage and elevation |
| Eye Relief |
3.2–3.5 in (81–89 mm) |
| Battery |
CR2032 |
| Length / Weight |
10.5 in (267 mm) / 19.1 oz (542 g) |
| Mount |
Requires 34 mm rings or a 34 mm cantilever mount, sold separately |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-SLX-1-10X28S-GRIF-M10S / 610156 / 818500016731 |
What's Included
- Primary Arms SLx 1-10x28 rifle scope
- CR2032 battery and documentation
Warranty
Covered by the Primary Arms Lifetime Warranty.
UK Delivery & Support
This rifle scope 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
What does the ACSS Griffin M10S reticle do?
The ACSS Griffin M10S combines a bold horseshoe and chevron for fast aiming at close range with a milliradian grid and ranging stadia, so at low power it works like a red dot sight and at high power it supports range estimation, bullet drop holdovers and wind holds.
Which calibre is the ACSS Griffin M10S calibrated for?
The ACSS Griffin M10S is a milliradian-based reticle rather than a calibre-specific bullet drop compensator, so its grid is stated in MIL and can be used with any cartridge once you know your own drops in MIL.
What mount does the Primary Arms SLx 1-10x28 need?
The Primary Arms SLx 1-10x28 has a 34 mm tube, so it requires 34 mm rings or a 34 mm cantilever mount, such as the Primary Arms SLx 34 mm cantilever mount. No mount is included with the scope.
What does second focal plane mean at 1x on this scope?
Second focal plane means the reticle stays the same visual size throughout the magnification range, so the Griffin M10S horseshoe stays large and easy to find at 1x, while its MIL grid measurements are only correct at one stated magnification.
Is the SLx 1-10x28 a true 1x at its lowest setting?
Yes. The Primary Arms SLx 1-10x28 gives a usable true 1x sight picture at the bottom of its range, so both-eyes-open shooting at close quarters is practical.
Can the illumination be used with night vision?
Yes. Two of the eleven brightness settings on the SLx 1-10x28 are night-vision compatible, so the reticle can be used behind a night-vision device without washing out the image.
