SIG SAUER Sierra4-BDX 6-24x50 Riflescope
- Magnification Minimum: 6x
- Magnification Maximum: 24x
- Objective Lens Diameter: 50 mm
- Night vision: No
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A BDX-connected scope that shifts holdover calculation to the electronics, best suited to hunters building out Sig's rangefinder-to-scope ecosystem.
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ASIN: B0FV91J2LWModel: SIERRA4-BDX 6-24x50Category: Rifle Scopes
More from this brandAll Sig Sauer rifle scopesOverview
The Sig Sauer Sierra4-BDX 6-24x50mm pairs a 6-24x zoom range with BDX Ballistic Data Xchange, syncing over Bluetooth with compatible rangefinders to project a holdover dot sized to the actual target distance.
The BDX-R2 digital reticle uses 194 individually controlled LEDs to place that holdover dot, driven by range data streamed from a paired BDX rangefinder within about 30 yards. SmartBDC lets a shooter pick from 9 onboard ballistic groups or build a custom profile instead. The housing carries Sig's Stealth ID coating to reduce visual signature and an IPX7 rating on a 30mm main tube.
- BDX Ballistic Data Xchange
- 194-LED BDX-R2 digital reticle
- Bluetooth pairing to 30 yards
- IPX7 waterproof 30mm tube
Who it's for
Hunters who already own or plan to pair a BDX-compatible rangefinder and want the scope to calculate holdover automatically instead of doing mental math at the range.
Pros and cons
- Automated holdover dot via BDX pairing
- 9 onboard ballistic groups plus custom profiles
- IPX7 waterproof 30mm tube
- SpectraCoat and LensArmor lens coatings
- Holdover feature needs a separate BDX rangefinder
- No rating or review data available yet
Performance notes
The BDX-R2 reticle uses 194 individually controlled LEDs to place an illuminated holdover dot that shifts with range data streamed over Bluetooth from a paired BDX rangefinder, with a stated pairing range up to 30 yards between the two devices. Shooters can pick from 9 onboard ballistic groups or build a custom profile through SmartBDC. The housing carries an IPX7 waterproof rating on a 30mm main tube, with SpectraCoat anti-reflection and LensArmor abrasion-resistant lens coatings.
Specifications
| Brand | Sig Sauer |
|---|---|
| Model | SIERRA4-BDX 6-24x50 |
| Dimensions & fit | |
| Objective Lens Diameter | 50 mmhigher than 69% of 309 rifle scopes |
| Item Weight | 0.6 poundslower than 92% of 238 rifle scopes |
| Construction & materials | |
| Material Type | See Description |
| Color | Black |
| Included components | |
| Included Components | See Description |
| Other details | |
| Magnification Minimum | 6x |
| Magnification Maximum | 24x |
| Night vision | No |
| Product Style | Tactical |
| Sport Type | Hunting & Shooting |
| Reticle Type | BDC |
Closest rivals on specs
Swarovski 59021 Riflescope- Item Weight 0.6 vs 0.91 pounds (-34%)
Trijicon Credo HX 2.5-15x42 SFP Riflescope- Objective Lens Diameter 50 vs 42 mm (+19%)
Swarovski Z3 3-10x42 Riflescope- Item Weight 0.6 vs 0.8 pounds (-25%)
- Objective Lens Diameter 50 vs 42 mm (+19%)
Frequently asked questions
Does the Sierra4-BDX need a separate rangefinder to work?
The illuminated BDX-R2 holdover dot requires pairing with a compatible BDX rangefinder over Bluetooth.
What is the pairing range between the scope and rangefinder?
Sig states the Bluetooth connection holds up to 30 yards.
What main tube size does the Sierra4-BDX 6-24x50mm use?
A 30mm main tube, with an IPX7 waterproof rating.