Sig Sauer Electro-Optics Sierra4 BDX 4-16x44mm 30mm Tube Illuminated BDX-R2 Riflescope

The Sig Sauer Sierra4 BDX is a feature-packed 4-16x44mm riflescope built around a 30mm main tube and a digital focal plane, designed to simplify long-range shooting by pairing with BDX-equipped laser rangefinders to deliver an illuminated holdover dot for the exact distance to your target.

At the heart of the optic is the illuminated BDX-R2 Ballistoc reticle, which uses 194 LED hold points to project a precise aiming reference once the scope is bonded to a KILO-series rangefinder. Sig Sauer's BDX 2.0 system uses the QUICKbond feature to rapidly link the riflescope to a BDX rangefinder over Bluetooth, then automatically accounts for your cartridge's ballistics, environmental conditions, and the measured range to display the correct hold without dialing.

The scope offers a wide magnification range from 4-16x with a 44mm objective, and the field of view runs 0.80 to 3.30 ft at 100 yds depending on magnification. Eye relief is 3.24" at the low end of the range and 2.44" at high power, giving a comfortable sight picture across the entire magnification range. The rugged matte black housing sits on the proven 30mm tube for generous internal adjustment travel, and the scope is built to handle real field conditions.

Weighing in at 22.70 oz, the Sierra4 BDX is a smart choice for hunters and precision shooters who want an automatically illuminated hold point at distance without manually dialing elevation. It ships ready to mount to standard 30mm rings and is fully compatible with the broader Sig Sauer BDX ecosystem of rangefinders, ballistic apps, and KILO lasers.