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Questions & Answers
Is there a Rangefinder set up with this scope and if so which one should I look at? Which one is most compatible with this scope? Expert Answer

Any of the Sig Kilo rangefinders that are labeled "BDX" will work with this rifle scope. The KILO 2200 and 2400 are great options and the KILO 3000 which is their binocular laser range finder is also a great option.

by Armando R., Gear Expert, June 4, 2019
Specs here on Optics Planet list eye relief as 1.5" to 3". Is this correct? 1.5" scope eye relief on a heavy recoiling long range rifle is painful. Expert Answer

The Sig Sauer Sierra3BDX 4.5-14x50mm Rifle Scope has an eye relief at its highest magnification of 3.35". At the scopes lowest magnification, the eye relief is 4.21".

by Ethan, Gear Expert, March 8, 2022
Customer Reviews
Helpful Positive Review Great scope for the money by TJ B, Verified Owner, February 19, 2019
I was skeptical getting this as it's a digital solution for an analog equation but I figured why not. I got this originally for a new .308 MDT Tac21 I was building but decided to go with a standard turret style scope for a bolt action. I put this o...
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13/14 found this helpful
Helpful Positive Review Sig Sierra3BDX 4.5x14x50mm by mmikeyq, September 23, 2020
Great glass, packed with amazing features. Put this Scope on a Ruger No 1 - 6.5 Creedmoor. What a combo. A little old school mixed with technology. Very happy with this purchase! Recommend to anyone who wants to do some long range hunting/shooting. I...
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2/3 found this helpful
Most Recent Reviews Sig bdx sierra by Jeepbilly, Verified Owner, February 18, 2024
Great Idea and concept. The cross hairs are a little thicker than I expected, and the glass isn’t as clear as I had hoped.
Read All 3 Reviews
Objective Lens Diameter: 50 mmMagnification: 4.5 - 14 xReticle: BDX-R1 Digital Tube Diameter: 30 mmReticle Focal Plane: Second Focal Plane (SFP) Exit Pupil: 3.6 - 8.9 mmIllumination Color: Red Finish: Matte Field of View, Linear: 6.7 - 19.9 ft at 100 ydsEye Relief: 3.35 - 4.21 inDiopter Adjustment Range: -2 - 2 dptColor: Black Weight: 2 lbAdjustment Click Value: 0.25 MOALength: 8 inAdjustment Type: MOA Parallax: Adjustable Illumination Type: LED Battery Type: CR2032 Width: 2 inHeight: 5 inFocus Range: 800 ydsLens Material: Glass Optical Coating: HD Brightness Settings: 10 Battery Life: 20,000 hoursWeather Resistance: Yes Water Resistance Level: IPX-7 Water Resistant Mark: 1 mFogproof: Yes Battery Quantity: 2 Package Type: Box Included Accessories: Standard Magnification Type: Variable Condition: Factory DEMO W/E Travel at 100 Yds: 55 MOAAttachment Type: Riflescope Ring

Code: SD9-RS-S3BDX50-SOSBDX34112-DEMO

MPN: SOSBDX34112-DEMO

Product No Longer Available

Product Info for SIG SAUER Sierra3BDX 4.5-14x50mm Rifle Scope, 30mm Tube, Second Focal Plane

The Sig Sauer SIERRA3BDX 4.5-14x50mm Tactical Rifle Scope is a hunter's best friend with LevelPlex digital anti-cant, KinETHIC kinetic energy transfer indicator, and a motion activated illumination that powers up when the scope senses motion. These Rifle Scopes by SIG SAUER include the integrated Ballistic Data Xchange that when paired via Bluetooth with a SIERRA3BDX rangefinder provides an illuminated ballistic holdover dot. The Sig Sauer SIERRA3BDX 4.5-14x50 Ballistic Rifle Scope features the SpectraCoat ultra-wide broadband, anti-reflection lens coatings for superior clarity and light transmission. You won't ever want to hunt without your Sig Sauer SIERRA3BDX 4.5-14x Illuminated Rifle Scope again!image

The world's most advanced rangefinders and Rifle Scopes are now even easier to use with the new BDX 2.0â„¢. BDX 2.0 means you can now choose, App-free easy set-up or if you desire to take your shooting to the next level of accuracy, then download our BDX smartphone app and configure your rangefinder and or rifle scope for your exact ballistics and environmental characteristics. BDX 2.0 also allows users to quickly and easily bond their rangefinders and sights with preset ballistic groups pre-loaded onto all BDX products that cover that vast majority of calibers on the market. These preset ballistic groups allow you to use BDX enabled products without the use of a smartphone app, so they are READY, RIGHT OUT OF THE BOX

Features of SIG SAUER Sierra3BDX 4.5-14x50mm Rifle Scope 30mm Tube, Second Focal Plane:

  • Integrated BDX Ballistic Data Xchange. A rangefinder and riflescope system that uses ballistics, environmental conditions and Bluetooth to illuminate the exact holdover dot;
  • Automatic holdover dot on a Digital Focal Plane, combining Second Focal Plane stadias, with an OLED illuminated ballistic holdover dot that automatically scales with zoom to subtend on target at any magnification level;
  • Features our MOTAC (Motion Activated Illumination) that powers up when it senses motion and powers down when it does not. Provides for optimum operational safety and enhanced battery life;
  • Spectracoat highly efficient, ultra-wide broadband, anti-reflection lens coatings reduce surface reflections to extremely low levels xacross the entire visible spectrum providing superior light transmission;
  • SIG SAUER's innovative KinETHIC kinetic energy transfer indicator. KinETHIC provides assistance in assuring an ethical hunt by indicating when energy on target drops below a threshold that can be set by the hunter using the SIG BDX App;
  • New for BDX riflescopes, Auto LevelPlex, automatically increases digital level sensitivity on longer shots

Package Contents:

  • SIG SAUER Sierra3BDX 4.5-14x50mm Rifle Scope 30mm Tube, Second Focal Plane
  • Battery
  • Lens covers
  • Wrench, Manual
  • Cloth

Riflescope Accessories

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SIG SAUER Sierra3BDX 4.5-14x50mm Rifle Scope, 30mm Tube, Second Focal Plane Unavailable & Discontinued Models

List of Unorderable Models

Demo, SIG SAUER Sierra3BDX Riflescope, 4.5-14x50mm, 30mm Tube, Second Focal Plane, BDX-R1 Digital Ballistic Reticle, Black, SOSBDX34112 , MPN: SOSBDX34112-DEMO , Code: SD9-RS-S3BDX50-SOSBDX34112-DEMO
SIG SAUER Sierra3BDX Riflescope, 4.5-14x50mm, 30mm Tube, Second Focal Plane, BDX-R1 Digital Ballistic Reticle, Black, SOSBDX34112 , MPN: SOSBDX34112 , UPC: 798681587063 , Code: SD9-RS-S3BDX50-SOSBDX34112
Open Box, Dealer Demo, SIG SAUER Sierra3BDX Riflescope, 4.5-14x50mm, 30mm Tube, Second Focal Plane, BDX-R1 Digital Ballistic Reticle, Black, SOSBDX34112 , MPN: SOSBDX34112-DMO , Code: SD9-RS-S3BDX50-SOSBDX34112-DMO
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