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First Look: SIG Sauer Sierra4-BDX Rifle Scopes
Tactical

First Look: SIG Sauer Sierra4-BDX Rifle Scopes

Jimmie Dempsey
Last updated: August 22, 2025 4:44 pm
Jimmie Dempsey Published August 22, 2025
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The new Sierra4-BDX is SIG Sauer’s most advanced BDX enabled riflescope yet. The scope pairs seamlessly with SIG’s line of Kilo BDX rangefinders and create a precise holdover dot based on your ballistic performance of your cartridge, environmental conditions and distance to the target.

The Sierra4-BDX riflescope simplifies shooting at distance by connecting to BDX-equipped rangefinders to deliver an illuminated holdover dot specific to your target distance, ballistic performance and other factors like the wind and weather. With a digital focal plane and 194 LED hold points, Sierra4-BDX scopes make it easy to make the shot when it matters the most.

Sierra4-BDX Features:

  • BDX Ballistic Data Xchange Technology: Pairs with KiloBDX rangefinders to calculate and display an exact holdover dot using real-time ballistic and environmental data.
  • BDX-R2 Digital Reticle: 194 individually controlled LEDs on a digital focal plane for hyper-precise aiming.
  • SmartBDC Technology: Choose from 9 onboard ballistic groups or customize your setup for total control.
  • Advanced Bluetooth Antennae: Improved connectivity up to 30 yards, an important feature for shooter-spotter pairs when terrain dictates your position.
  • Rugged Performance: Waterproof (IPX7), 30mm main tube and high-grade optical system with up to 95 percent light transmission.

Sierra4-BDX 4-16x44mm Second Focal Plane (SFP) Specifications

  • Magnification: 4-16X
  • Objective Lens Diameter: 44 mm
  • Weight : 22.7 ounces
  • Main Tube Diameter: 30mm
  • Total Elevation Travel: 70 MOA+

Sierra4-BDX 6-24x50mm Second Focal Plane (SFP) Specifications

  • Magnification: 6-24X
  • Objective Lens Diameter: 50mm
  • Weight : 24.4 ounces
  • Main Tube Diameter: 30mm
  • Total Elevation Travel: 48 MOA+

MSRP for the Sierra4-BDX 4-16x44mm is $699.99, and the MSRP for the Sierra4-BDX 6-24x50mm is $799.99. More information on these new optics, the KiloBDX line of rangefinders and other firearms, accessories and optical products made by SIG Sauer is available at sigsauer.com.

Read the full article here

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