GS3 4-20x50

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The new Steiner GS3 “game sensing” scope utilizes exclusive CAT (color adjusted transmission) lens coatings to amplify contrast in the peak human vision sensitivity range. The optimized contrast effectively separates game from leafy or shadow-dappled backgrounds, exposing your target to a clean, accurate shot. And the GS3 5x zoom range lets hunters from eastern whitetail country to western big game ranges pair their new scope with their favorite centerfire, rimfire or muzzleloader rifle. And or course, Steiner’s bedrock reliability will always deliver unfailing performance, whatever firearm or target you prefer.

Vesatile enough for prairie dogs, big game or the bean field.

  • Magnification 4x-20x
  • Tube Diameter 30mm
  • Length 16.4
  • Weight 28.2 oz
  • Item no. 5007 (Plex S7)
  • Item no. 5008 (Plex S1)
MSRP New: 

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Product Comparisons

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Product Features: 

New 5x Zoom Range

provides sharp resolution at long distances for more accurate shooting for wide open areas.


CAT™ Color Adjusted Transmission

amplifies contrast in the peak human vision sensitivity range, to spot game in any environment.


Steiner Plex S1/S7 Reticles

help determine holdover for distance and cascading dots/lines compensate for wind.


Short Mounting Length

of just 5.4 inches for mounting on short actions, muzzleloaders or lightweight mountain rifles.


Rugged 30mm Tube

milled from solid aluminum stock so there are no welds or seams, for greater strength and durability.



durable construction you can trust to stand up to any cold or wet condition.

GS3 4-20x50 is rated 4.25 out of 5 by 4.
Rated 5 out of 5 by from Best for the money! Just bought this scope at Easthill Outdoors in Ont. Canada, my favourite shop. Put it on a Sako Finnlight 270 WSM, with Optilock bases and extra low rings and took it to the range. It's mid January at -20C with a good wind and shot 5 quarter sized groups at 200yds. I can't wait to try it at longer distances. Great package, awesome products!
Date published: 2015-01-15
Rated 4 out of 5 by from Features are great ergonomically, although magnification knob is very stiff and pulls you off target. Could also use a longer eye relief. It has served me well in both Africa and here in North America. The 50mm allows for quick target acquisition. Optics are crystal clear. l
Date published: 2014-08-05
Rated 4 out of 5 by from Quality Product Purchased a few weeks ago for a new rifle build I am working on. The clarity is great compared to most everything in it's price range. I am mounting on a 1 pc rail so the lack of mounting surface was no issue. It tracks well and runs a box test like a dream assuming you take the time to do a proper install. Clicks are crisp to the feel and light but audible to the ear. It's heavy but not excessive and for most of my purposes a non issue.
Date published: 2015-06-03
Rated 4 out of 5 by from Excellent value I purchased this for a Remington 700 in 7mm mag. I choose the S-7 retical because it is designed for 22-250 which has very similar ballistics up to 700 yards. The scope was in perfect shape at delivery. The eyebox is very generous at all but the highest magnifications, and even then maybe more forgiving than some of my other brands. Very good clarity and focus, very good brightness and only average low light visibility. I wish I could have afforded the night hunter series. The focus ring is rubber wrapped and a little too stiff. My rubber ring will bunch up out of position while adjusting in one direction. I may try adding some adhesive under the loose spot. I talked with customer service with a few questions before I purchased and they were great. They gave me ring and mount options and part numbers and I took there advice and everything fit fine with this large scope. I asked about the glass and they did state that it was apochromatic only, not achromatic. I still don't know the exact origin of the lenses but I would like to. This scope has the thirty mm tube and a large ocular end so it does have a very easy, relaxed view, and despite the apochromatic glass I don't see much chromatic aberration at all. The warranty is second to none in this industry.
Date published: 2015-04-19
  • 2015-07-06T13:05CST
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Hi! Two questions. I will be mounting it on a Sig SSG3000.  Do you have any recommendations re: rings? Can one estimate range with the reticle hash marks? I.e. how many inches from the first elev. mark from zero at 100, 200 yds etc? Thanks!

Asked by: Eric J
The subtensions of the reticle will vary between the S1 and S7. For specific measurements please contact customer support at 888-228-7747 and they can provide you with the subtensions as well as advise what the hash marks will indicate in yards.
Answered by: SteinerCustomerService
Date published: 2015-05-13

Not a big deal for me but does this scope have threads for anti-glare or sunshade attachments? Also, at what magnification levels are the S1 reticle accurate at? I couldn't find the reticle user guide mentioned in another answer.

Asked by: Eric J
The reticle is accurate at maximum magnification. We do not manufacture a sunshade for the GS3 riflescope.
Answered by: SteinerCustomerService
Date published: 2015-05-13

I am considering a GS3 4x-20 x 50 w the S1 reticle. I will be shooting 300 WSM, 308 and 22-250. The S7 reticle is calibrated for the 22-250. What is the S1 calibrated for? Why does the S7 reticle look smaller than the S!?

Asked by: BG01
The images do not depict the actual size of the reticles, and the S1 is much smaller than pictured. There is not a certain caliber that the S1 is calibrated for. However, we can let you know how the reticle will work with your load. Please contact customer service for further assistance. 888-228-7747 option 2
Answered by: Steiner Optics JL
Date published: 2015-04-22

Why is it to hard to re zero the scope? Im using a little screw driver and I cant do nothing.  I dont want to put more pressure because I think Im gonna break it.  A video showing THIS could ve awsome. Thanks

Asked by: joe38
Please contact customer service, we will be glad to walk you throught this process. 888-228-7747 option 2
Answered by: Steiner Optics JL
Date published: 2015-04-22

I understand this scope is assembled in Colorado, but where are the lenses sourced from?

Asked by: Jeffrey
We get the lenses for the GS3 scopes from Steiner Germany.
Answered by: Steiner Optics JL
Date published: 2015-05-06

You have two weights listed 28.2 oz and 22 oz which is correct for the 4-20x50 ? -  I am asking this question too- it is pretty important especially for those who are not close to a dealer.

Asked by: Mack
Our catalog info is 28.2, so we're sticking with that here. It looks like one of our customer service reps weighed it - the scope alone - and got 24.8 oz. I can't find the reference to 22 oz - that was most likely a typo that was fixed.
Answered by: TeamSteiner
Date published: 2015-04-14

Recently purchased a GS3 and love it. I plan on purchasing a second one. Do you guys offer cerakote on your scopes??

Asked by: Dale222
Thanks for the supporty! We do not offer any scopes in Cerakote.
Answered by: TeamSteiner
Date published: 2015-04-14

You have two weights listed 28.2 oz and 22 oz which is correct for the 4-20x50 ?

Asked by: Benny
The exact weight of the 4-20x50mm scope -ONLY- is 24.8oz, as measured by a postal scale.
Answered by: pharding
Date published: 2015-04-14
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Riflescope Specifications: 
Item Number5007-S7 | 5008-S2
Objective Lens Diameter50 mm
Tube Diameter30 mm
Focal Plane2nd
Field of View @ 100 yds.25.8 / 5.5
Eye Relief3.5 - 4.3
Exit Pupil (mm)11 - 2.5
Weight (oz.)28.2
Diopter Adjustment Range+2 to -3
ReticleSteiner Plex S7 or Plex S1
Elevation Adjustment KnobResettable Zero
Wind/Elevation Click Value1/4 MOA
Windage Range @100 m48 MOA
Elevation Range @100 m64 MOA
Parallax/FocusSide Focus
Parallax/Focus Range164 ft -infinity
Nitrogen FilledYes
Special FeaturesCAT™ Color Adjusted Transmission Coatings
WarrantyHeritage™ Warranty
Specifications subject to change without notice


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