Sig Sauer SIERRA3BDX 6.5-20x52mm Riflescope, BDX-R1 Digital, Side Focus, 0.25 MOA Adjustment, Black

The Sig Sauer SIERRA3BDX 6.5-20x52mm riflescope brings ballistic computing to your rifle through an integrated digital system that pairs with compatible Sig rangefinders via Bluetooth. This isn't just a traditional variable power scope—it's part of Sig's BDX ecosystem, designed to eliminate holdover guesswork by displaying an auto-adjusting dot that accounts for your range, environmental conditions, and ballistics data in real time. For hunters who want precision without the mental math, the SIERRA3BDX translates rangefinder data into a simple aiming point: range the target, place the illuminated holdover dot, and shoot.

The scope features a second focal plane design with an OLED-illuminated digital reticle that scales automatically as you adjust magnification, keeping your holdover holdover accurate from 6.5x to 20x. The BDX-R1 digital reticle integrates Sig's KinETHIC kinetic energy indicator, which alerts you if bullet energy drops below your configured threshold—helping ensure ethical takedowns. Side focus adjustment gives you quick parallax correction without reaching behind the scope, and 0.25 MOA click increments provide repeatable adjustment for fine-tuning at distance. Spectracoat lens coatings maximize light transmission across the visible spectrum, critical for early morning and late evening hunting when every photon counts.

Durability is built in: IPX-7 waterproof rating means the scope survives complete submersion to 1 meter, and fog-proof optics stay clear in temperature swings. Motion-activated illumination (MOTAC) powers the reticle only when you move, conserving battery life between two CR2032 cells. The scope is black, 52mm objective, and designed for hunters who've already invested in Sig's BDX rangefinder ecosystem or are building a modern long-range hunting rig from scratch.

Key Features

• Integrated BDX system automatically calculates and displays holdover dot via Bluetooth connection to compatible Sig rangefinders
• OLED digital reticle automatically scales with magnification to maintain holdover accuracy at any zoom level
• KinETHIC kinetic energy indicator alerts you when bullet energy falls below your set threshold for ethical shot placement
• Motion-activated illumination (MOTAC) extends battery life by powering down when not in use
• 6.5-20x magnification range with 52mm objective for hunting at extended distance
• Side focus parallax adjustment for quick, tool-free correction
• SpectraCoat ultra-wide broadband anti-reflection lens coatings for superior light transmission
• IPX-7 waterproof (complete immersion to 1 meter) and fog-proof for all-weather reliability
• 0.25 MOA click increments for precise, repeatable adjustments

Specifications

Frequently Asked Questions

What rangefinders work with the SIERRA3BDX scope?

The SIERRA3BDX connects via Bluetooth to BDX-capable Sig Sauer rangefinders. Check that your rangefinder model supports BDX integration before pairing.

Can I use this scope without a BDX rangefinder?

Yes. The SIERRA3BDX functions as a standard riflescope with manual holdover using the BDX-R1 digital reticle. The automatic ballistic holdover feature requires a paired BDX rangefinder, but you can operate the scope and adjust elevation and windage conventionally.

What does KinETHIC do?

KinETHIC is Sig's kinetic energy indicator that monitors whether your bullet's energy on target remains above a threshold you set using the Sig BDX App. It alerts you if energy drops below that level, helping ensure your shot meets ethical hunting standards.

How long do the batteries last?

The scope uses two CR2032 batteries. Battery life depends on illumination use and motion-activation frequency. Motion-activated illumination (MOTAC) extends runtime by powering down the reticle when the scope is stationary.