The SIG Sauer Sierra3BDX 4.5-14x50mm Rifle Scope (SIG part no. SOSBDX34112) hides SIG’s BDX Ballistic Data Xchange system inside the form factor of a traditional riflescope. Paired with a BDX-capable KILO rangefinder, it delivers an illuminated auto-holdover dot so hunters can range and hold in one motion instead of doing math in the field. The matte black 30mm-tube scope covers a 4.5-14x magnification range with a 50mm objective for a bright, wide field of view from dawn to dusk. It’s built for hunters and long-range shooters who want rangefinder-driven precision without a separate ballistic app or turret dial session.

Key Specifications

• 4.5-14x magnification range covers close woods hunting through longer open-country shots.
• 50mm objective lens gathers extra light for a brighter sight picture in low light.
• 30mm tube diameter provides a strong mounting platform and generous internal adjustment.
• Second focal plane Illuminated BDX-R1 reticle delivers an automatic holdover dot when paired with a BDX rangefinder.
• .25 MOA click adjustments allow fine, repeatable zeroing.
• Adjustable parallax set to 100 yards reduces reticle shift at typical hunting distances.
• Eye relief of 3.35 to 4.21 inches keeps the scope comfortable and safe under recoil.
• SpectraCoat lens coating improves light transmission and reduces glare.
• Overall length of 12.75 inches fits standard rifle mounting setups.

Frequently Asked Questions

Do I need a rangefinder to use the BDX holdover feature? Yes, the automatic holdover dot requires pairing with a BDX-capable SIG KILO rangefinder over Bluetooth; without one, it still functions as a standard illuminated riflescope.

Is this scope waterproof? Yes, it carries an IPX-7 rating for complete water immersion along with fog-proof construction.

What powers the illumination? SIG’s MOTAC motion-activated illumination powers the reticle on when it senses movement and shuts off automatically when still, extending battery life.

Buy the SIG Sauer Sierra3BDX 4.5-14x50mm Rifle Scope

Order this Sierra3BDX from our Lubbock, Texas gun shop for fast, insured shipping, and pair it with the rest of our gun scopes selection for your next hunt.