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Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive & 2 MOA Red Dot Reticle Black

Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive & 2 MOA Red Dot Reticle Black

Primary Arms · Sights & Optics

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Best price

$133.54at MidwayUSA

In stock Sale checked Nov 10, 2026

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Where to buy

StorePriceAvailabilityBuyAdd to build
MidwayUSA Best price $133.54Salechecked Nov 10, 2026 In stock Buy at MidwayUSA
OpticsPlanet $179.99Salechecked Nov 10, 2026 In stock Buy at OpticsPlanet
Kentucky Gun Co $179.99checked Nov 10, 2026 In stock Buy at Kentucky Gun Co

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

Lowest in-stock price in the last 30 days: $133.54 at MidwayUSA. Dashed line = out of stock. Tracking since Nov 8, 2026.

Show the prices as a table
StoreLatestLowestHighest
Kentucky Gun Co$179.99$179.99$179.99
MidwayUSA$133.54$133.54$133.54
OpticsPlanet$179.99$179.99$179.99

Since Nov 8, 2026.

About this part

The Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive & 2 MOA Red Dot Reticle Black is a red dot sight from Primary Arms. It's sold by 3 stores (3 in stock), from $133.54 to $179.99. The lowest in-stock price in the last 30 days was $133.54 at MidwayUSA.

Specifications

Manufacturer
Primary Arms
Color
Black
Type
Red Dot
Illuminated
Yes
Magnification
1x
Magnification class
1x (non-magnified)

From the manufacturer

Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive & 2 MOA Red Dot Reticle Black. Weighing only 5 ounces the SLx MD-21 is both lightweight and rugged featuring upgraded mounting hardware for guaranteed rigidity and precision when you need it most. If you are looking for a taller mount check out the SLx 2.26in Mount for use with night vision or if you prefer a more headsup shooting position. The upgraded LED emitter offers complete night vision compatibility as well as a true Red Dot Bright reticle with an ultra-long runtime for full operability in any environment. Additionally the Autolive technology shuts off the reticle when no motion is detected for two minutes and immediately turns on as soon as you pick it up. This Primary Arms red dot sight is part of the SLx optics line. SLx optics have built a reputation for innovation reliability and value. All SLx optics undergo rigorous field-testing during development to best serve you in any environment. Specifications for Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive: Manufacturer: Primary Arms Color: Black Magnification: 1 x Objective Lens Diameter: 21 mm Illumination Type: LED Illumination Color: Red Adjustment Click Value: 1/2 MOA Emitter Type: Enclosed Battery Type: Lithium Metal CR2032 Weight: 5 oz Red Dot Sights-Footprint: Not Applicable Features of Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive Autolive technology extends battery life Fully multicoated lens Top mounted push button controls Night vision compatibility Shockproof and waterproof aluminum construction Standard microdot footprint Package Contents: Primary Arms SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive Low mount and Absolute Cowitness mount with spacer (1.41in or 1.535in Height) Primary Arms 810027: SLx MD-21 Push Button 1x21mm Micro Reflex Red Dot Sight w/AutoLive & 2 MOA Red Dot Reticle Black

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$133.54 at MidwayUSA
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