Primary Arms
Shop Primary Arms at Onyx Armaments — the SLx and GLx MicroPrism scopes at 1X, 3X and 5X, the MD-21, MD-21S and MD-25 tube red dots, and the RS-10R mini reflex sight.
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Primary Arms SLx 1X MicroPrismT Scope Red Illuminated ACSS Cyclops Gen II Reticle H1/T1 Footprint
Primary Arms
Primary Arms SLx 1X MicroPrismT Scope Red Illuminated ACSS Cyclops Gen II Reticle H1/T1 Footprint
£309.99 -
Primary Arms SLx 1X MicroPrismT Scope Green Illuminated ACSS Cyclops Gen II Reticle H1/T1 Footprint
Primary Arms
Primary Arms SLx 1X MicroPrismT Scope Green Illuminated ACSS Cyclops Gen II Reticle H1/T1 Footprint
£309.99 -
Primary Arms SLx 1X MicroPrismT Scope Green Illuminated ACSS Gemini 9mm Reticle H1/T1 Footprint
Primary Arms
Primary Arms SLx 1X MicroPrismT Scope Green Illuminated ACSS Gemini 9mm Reticle H1/T1 Footprint
£309.99 -
Primary Arms SLx 1X MicroPrismT Scope Red Illuminated ACSS Gemini 9mm Reticle H1/T1 Footprint
Primary Arms
Primary Arms SLx 1X MicroPrismT Scope Red Illuminated ACSS Gemini 9mm Reticle H1/T1 Footprint
£309.99 -
Primary Arms SLx 1X MicroPrismT Scope RDB Illuminated T-Dot Reticle H1/T1 Footprint
Primary Arms
Primary Arms SLx 1X MicroPrismT Scope RDB Illuminated T-Dot Reticle H1/T1 Footprint
£309.99 -
Primary Arms GLx 1X MicroPrism Scope Green Illuminated ACSS Cyclops Reticle
Primary Arms
Primary Arms GLx 1X MicroPrism Scope Green Illuminated ACSS Cyclops Reticle
£349.99 -
Primary Arms GLx 1X MicroPrism Scope Red Illuminated ACSS Cyclops Reticle
Primary Arms
Primary Arms GLx 1X MicroPrism Scope Red Illuminated ACSS Cyclops Reticle
£349.99 -
Primary Arms SLx 3X MicroPrism Scope Red Illuminated ACSS Raptor 5.56/.308 Yard Reticle FDE
Primary Arms
Primary Arms SLx 3X MicroPrism Scope Red Illuminated ACSS Raptor 5.56/.308 Yard Reticle FDE
£399.99 -
Primary Arms SLx 3X MicroPrism Scope Green Illuminated ACSS Raptor 5.56/.308 Yard Reticle
Primary Arms
Primary Arms SLx 3X MicroPrism Scope Green Illuminated ACSS Raptor 5.56/.308 Yard Reticle
£399.99 -
Primary Arms SLx 3X MicroPrism Scope Red Illuminated ACSS Raptor 5.56/.308 Yard Reticle
Primary Arms
Primary Arms SLx 3X MicroPrism Scope Red Illuminated ACSS Raptor 5.56/.308 Yard Reticle
£399.99 -
Primary Arms SLx 5X MicroPrism Scope Red Illuminated ACSS Aurora MIL Reticle
Primary Arms
Primary Arms SLx 5X MicroPrism Scope Red Illuminated ACSS Aurora MIL Reticle
£429.99
Primary Arms, explained.
The reticle is the reason to buy Primary Arms, and ACSS is the system behind it. Rather than a bare dot, an ACSS reticle etches a central aiming point together with drop compensation below it, ranging brackets sized to a torso and wind holds either side, all calibrated to a particular cartridge and a particular unit of measure — so ranging, holdover and lead come off the reticle in one look instead of from a dial. The names tell you which job each pattern does: Raptor 5.56/.308 is the yard-calibrated drop reticle for a general-purpose rifle, Aurora is the MIL version for shooting in milliradians, Cyclops and Cyclops Gen II reduce the whole thing to a single ringed aiming point for speed, Gemini is calibrated for 9mm, and ACSS-CQB is the close-quarters pattern used on the MD-21 red dots. A plain T-Dot is offered on the RDB model if you would rather have an uncluttered reticle.
After the reticle, two choices remain. Magnification is fixed on a prism, so 1X is the red dot replacement — same both-eyes-open handling, but with an etched reticle that stays visible with the illumination off and looks crisp to eyes that see a projected dot as a smear — while 3X and 5X trade that speed for identification and useful holds at distance. Then the tier: SLx is the value line and GLx the higher-specified one, with better glass and adjustments. The 1X MicroPrismT models use the H1/T1 footprint, so they bolt onto mounts already made for micro red dots and swap in without new hardware. Which one do you need? Set the height with the optic mount height guide.
Explore more: Prism Scopes, Red Dot Sights, Scope Mounts & Optic Risers, or all Rifle Scopes. £5 tracked UK delivery in 7–10 business days.