Availability: In Stock
The Sig Sauer Sierra4 BDX is a 4-16x44mm rifle scope built for hunters and long-range shooters who want ballistic calculation and environmental data fed directly into their optic. This isn't just a scope with a reticle—it's a connected system. Pair it with a Sig BDX-equipped rangefinder, and the scope receives real-time ballistic solutions that account for distance, wind, temperature, and spin drift, displaying an exact holdover dot on the digital focal plane. The result is faster, more confident shots at distance without manual math or guesswork.
The scope's 194 individually controlled LEDs form the BDX-R2 digital reticle, which lives on a digital focal plane rather than etched glass. That means the reticle and the target stay locked together at a precise scale, eliminating the parallax error that plagues traditional reticles and improving accuracy further. You can also run SmartBDC mode to choose from nine onboard ballistic groups or load a custom profile if you prefer to shoot without a rangefinder. The 30mm main tube delivers rugged, waterproof (IPX7) construction, and the optical system transmits up to 95% of available light for a bright, clear sight picture across the 4x to 16x magnification range. Bluetooth connectivity reaches up to 30 yards—useful for shooter-spotter pairs who need to stay in sync across broken terrain.
At 4-16x magnification with a 44mm objective, this scope covers everything from mid-range hunting to precision rifle work. The eye relief spans 2.44 to 3.24 inches, and the field of view runs from 3.33 feet at 100 yards on low magnification to 1.25 feet on high. Total elevation and windage travel both exceed 70 MOA, and each rotation of the turrets adjusts point of aim by 25 MOA. Two CR2032 batteries power the digital reticle. No mount is included, so plan on sourcing a 30mm scope ring separately.
If you're already invested in the Sig BDX rangefinder ecosystem, the Sierra4 BDX closes the loop between distance measurement and ballistic solution. If not, the scope still functions as a premium variable-power optic with onboard ballistic profiles and a bright digital reticle—and the system is there if you ever decide to add a rangefinder down the road.
| Magnification | 4–16x |
| Objective Lens Diameter | 44 mm |
| Main Tube Diameter | 30 mm |
| Overall Length | 12.0 in |
| Weight | 22.7 oz |
| Focal Plane | Digital |
| Reticle | BDX-R2 Digital Ballistic with 194 LEDs |
| Illumination | Yes—194 individually controlled LEDs |
| Eye Relief (Low) | 3.24 in |
| Eye Relief (High) | 2.44 in |
| Field of View (Low) | 3.33 ft @ 100 yards |
| Field of View (High) | 1.25 ft @ 100 yards |
| Diopter Adjustment Range | ±2 |
| Total Elevation Travel | >70 MOA |
| Total Windage Travel | >70 MOA |
| Travel Per Rotation | 25 MOA |
| Waterproof Rating | IPX7 |
| Light Transmission | Up to 95% |
| Battery | 2 CR2032 |
| Color | Black |
| Mount Included | No |
Yes. The scope includes SmartBDC onboard ballistics—you can select from nine factory ballistic groups or build a custom ballistic profile loaded into the scope itself. The BDX rangefinder connectivity adds convenience and real-time environmental corrections, but it's not required to use the scope. You can dial and aim manually just like any high-quality rifle scope.
The scope pairs with Sig Sauer's BDX-equipped rangefinders via Bluetooth. For a specific model list, confirm compatibility with Sig's product documentation or contact our team, as new rangefinder models may be released.
No. The scope has a 30mm main tube and requires a separate 30mm scope ring or mount. Make sure your mount and rings are rated for 30mm tubes.
The scope runs on two CR2032 batteries. For estimated runtime and battery-life information under typical field use, consult Sig Sauer's product literature or user manual.
SKU: 194199274 • Width: 10.1in • Height: 5in • Depth: 21.3in • Weight: 3.15oz
Availability: In Stock
The Sig Sauer Sierra4 BDX is a 4-16x44mm rifle scope built for hunters and long-range shooters who want ballistic calculation and environmental data fed directly into their optic. This isn't just a scope with a reticle—it's a connected system. Pair it with a Sig BDX-equipped rangefinder, and the scope receives real-time ballistic solutions that account for distance, wind, temperature, and spin drift, displaying an exact holdover dot on the digital focal plane. The result is faster, more confident shots at distance without manual math or guesswork.
The scope's 194 individually controlled LEDs form the BDX-R2 digital reticle, which lives on a digital focal plane rather than etched glass. That means the reticle and the target stay locked together at a precise scale, eliminating the parallax error that plagues traditional reticles and improving accuracy further. You can also run SmartBDC mode to choose from nine onboard ballistic groups or load a custom profile if you prefer to shoot without a rangefinder. The 30mm main tube delivers rugged, waterproof (IPX7) construction, and the optical system transmits up to 95% of available light for a bright, clear sight picture across the 4x to 16x magnification range. Bluetooth connectivity reaches up to 30 yards—useful for shooter-spotter pairs who need to stay in sync across broken terrain.
At 4-16x magnification with a 44mm objective, this scope covers everything from mid-range hunting to precision rifle work. The eye relief spans 2.44 to 3.24 inches, and the field of view runs from 3.33 feet at 100 yards on low magnification to 1.25 feet on high. Total elevation and windage travel both exceed 70 MOA, and each rotation of the turrets adjusts point of aim by 25 MOA. Two CR2032 batteries power the digital reticle. No mount is included, so plan on sourcing a 30mm scope ring separately.
If you're already invested in the Sig BDX rangefinder ecosystem, the Sierra4 BDX closes the loop between distance measurement and ballistic solution. If not, the scope still functions as a premium variable-power optic with onboard ballistic profiles and a bright digital reticle—and the system is there if you ever decide to add a rangefinder down the road.
| Magnification | 4–16x |
| Objective Lens Diameter | 44 mm |
| Main Tube Diameter | 30 mm |
| Overall Length | 12.0 in |
| Weight | 22.7 oz |
| Focal Plane | Digital |
| Reticle | BDX-R2 Digital Ballistic with 194 LEDs |
| Illumination | Yes—194 individually controlled LEDs |
| Eye Relief (Low) | 3.24 in |
| Eye Relief (High) | 2.44 in |
| Field of View (Low) | 3.33 ft @ 100 yards |
| Field of View (High) | 1.25 ft @ 100 yards |
| Diopter Adjustment Range | ±2 |
| Total Elevation Travel | >70 MOA |
| Total Windage Travel | >70 MOA |
| Travel Per Rotation | 25 MOA |
| Waterproof Rating | IPX7 |
| Light Transmission | Up to 95% |
| Battery | 2 CR2032 |
| Color | Black |
| Mount Included | No |
Yes. The scope includes SmartBDC onboard ballistics—you can select from nine factory ballistic groups or build a custom ballistic profile loaded into the scope itself. The BDX rangefinder connectivity adds convenience and real-time environmental corrections, but it's not required to use the scope. You can dial and aim manually just like any high-quality rifle scope.
The scope pairs with Sig Sauer's BDX-equipped rangefinders via Bluetooth. For a specific model list, confirm compatibility with Sig's product documentation or contact our team, as new rangefinder models may be released.
No. The scope has a 30mm main tube and requires a separate 30mm scope ring or mount. Make sure your mount and rings are rated for 30mm tubes.
The scope runs on two CR2032 batteries. For estimated runtime and battery-life information under typical field use, consult Sig Sauer's product literature or user manual.
SKU: 194199274 • Width: 10.1in • Height: 5in • Depth: 21.3in • Weight: 3.15oz