The Sig Sauer SIERRA4BDX 4-16×44 (MPN SOSBDX44111) is a digital-focal-plane riflescope built around Sig’s Ballistic Data Xchange system. Pair it by Bluetooth with a compatible KILO-BDX rangefinder and the BDX-R2 reticle’s 194 individually controlled LEDs light up an automatic holdover dot for the exact ranged distance, no manual dialing required.

Key Specifications

• 4-16x magnification. A wide zoom range for everything from close cover to open-field shots.
• 44mm objective lens. Gathers plenty of light for a bright sight picture at higher power.
• BDX-R2 digital reticle with 194 LEDs. Lights an automatic holdover dot on the digital focal plane once ranged.
• Bluetooth BDX connectivity. Pairs with a Sig KILO-BDX rangefinder over up to 30 yards to calculate ballistics on the fly.
• SmartBDC ballistic groups. Choose from 9 onboard profiles or a custom setup to match your load.
• 30mm main tube. Waterproof to IPX7 with up to 95 percent light transmission.
• 3.24 to 2.44 inches of eye relief. Consistent eye box across the zoom range.
• 0.25 MOA clicks. With more than 70 MOA of total elevation and windage travel.
• Two CR2032 batteries. Power both the illuminated reticle and the BDX electronics.
• About 22.7 ounces. A manageable weight for a full-featured digital riflescope.

Frequently Asked Questions

What does BDX mean on this Sig Sauer riflescope?

BDX stands for Ballistic Data Xchange. Paired by Bluetooth with a compatible Sig KILO-BDX rangefinder, the SIERRA4BDX displays an automatic holdover dot for the ranged distance.

Does the SIERRA4BDX work without a KILO-BDX rangefinder?

Yes. It still functions as a standard illuminated 4-16×44 riflescope with manual reticle holdovers if you aren’t running a paired rangefinder.

What batteries does this scope use?

It runs on two CR2032 batteries, which power both the illuminated reticle and the BDX electronics.

Buy the Sig Sauer Sierra4BDX 4-16×44 Riflescope

Get connected, ballistics-corrected aiming with the Sierra4BDX 4-16×44. Shop the full Sig Sauer lineup or browse more Gun Scopes in our Gun Scopes category at Schaefer Defense.