The SIG Sauer SIERRA6BDX 2-12x40 Rifle Scope is a compact, smart hunting rifle scope built around SIG's BDX Ballistic Data Xchange technology. Paired with a compatible SIG BDX rangefinder, the BDX-R2 digital reticle lights an intelligent holdover dot based on range, ballistics and environment — taking the guesswork out of field shots.
The versatile 2-12x range and 40mm objective suit lightweight hunting rifles, shotguns, muzzleloaders and crossbows, while the HDX 6x optical system delivers up to 95% light transmission. LevelPlex digital anti-cant and the KinETHIC energy indicator add confidence in the field.
How It Compares
Need more reach? Step up to the SIERRA6BDX 3-18x44 or the long-range 5-30x56. Browse all SIG Sauer rifle scopes, the wider SIG Sauer range, and read what is MOA.
Ideal For
- Hunting rifles, shotguns, muzzleloaders and crossbows
- Lightweight, compact builds
- Shooters using a compatible SIG BDX rangefinder
- Medium-range field use
Key Features
- 2-12x40, 30mm tube, SFP
- BDX-R2 digital ballistic reticle with BDX 2.0
- Auto illuminated holdover dot (with BDX rangefinder)
- HDX 6x optics, up to 95% light transmission
- 0.25 MOA turrets, 60 MOA travel; LevelPlex anti-cant
- Argon-purged, IPX7
Technical Specifications
| Magnification |
2-12x |
| Objective |
40 mm |
| Tube |
30 mm |
| Reticle |
BDX-R2 digital ballistic (SFP) |
| Click Value |
0.25 MOA |
| Adjustment Range |
60 MOA elevation / 60 MOA windage |
| Parallax |
Fixed 100 yd |
| Battery |
2× CR2032 |
| Length / Weight |
10.75 in / 21.4 oz |
| Waterproof |
IPX7, argon-purged |
| Warranty |
SIG Infinite Guarantee |
What's Included
- SIG SIERRA6BDX 2-12x40 rifle scope
- 2× CR2032 batteries, quick start guide
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and SIG's Infinite Guarantee.
Frequently Asked Questions
What is BDX?
SIG's Ballistic Data Xchange — paired with a compatible SIG BDX rangefinder, the scope automatically displays an illuminated holdover dot for the ranged distance.
Does it work without a rangefinder?
Yes — it works as a standard illuminated scope, but the auto-holdover feature needs a compatible BDX rangefinder.
What mount does it need?
A 30mm mount or rings — see our rifle scope mounts.
