SIG SAUER Sierra3BDX 3.5-10x42 Rifle Scope and Rangefinder Kit
- Magnification Minimum: 3.5x
- Magnification Maximum: 10x
- Objective Lens Diameter: 42 mm
- Mounting Type: Picatinny Mount, Weaver Mount
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A rangefinder and scope pre-paired over Bluetooth so ranging and holdover become one action, built for hunters willing to set up the BDX app first.
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ASIN: B0DB683RX3Model: SIERRA3BDXCategory: Rifle Scopes
More from this brandAll Sig Sauer rifle scopesOverview
A matched Sig Sauer BDX kit pairing the Sierra3BDX 3.5-10x42mm SFP riflescope with the Kilo2800 6x22mm laser rangefinder. The rangefinder ranges a target and sends the ballistic solution to the scope over Bluetooth, which lights the correct holdover point on the reticle.
The idea is that ranging and holdover become one step: range with the Kilo2800 and the Sierra3BDX reticle shows the aiming point, rated to about 800 yards at 1 MOA. Both units are IPX7 rated with Sig's Spectracoat lens coatings. Setup requires the free BDX app and a saved ballistic profile before pairing does anything.
- Sierra3BDX 3.5-10x42mm SFP scope with BDX-R1 reticle
- Kilo2800 6x22mm rangefinder with Hyperscan mode
- Bluetooth ballistic solution to 800 yards
- IPX7 waterproof housings on both units
Who it's for
Hunters and long-range shooters who want a rangefinder and scope pre-matched rather than paired manually. Not for anyone who wants a simple fixed reticle with no app or battery dependency.
Pros and cons
- Rangefinder and scope pair automatically over Bluetooth
- Illuminated reticle shows holdover without manual math
- IPX7 rated for wet field use
- Sold as a matched kit rather than two separate purchases
- Needs the BDX app and a saved ballistic profile to function
- Bluetooth pairing adds a point of failure versus a fixed reticle
- No rating or review data yet
Performance notes
The system runs on Sig's Applied Ballistics Ultralight software in the rangefinder, so the aiming solution depends on entering accurate rifle and ammo data during setup. Hyperscan mode takes four range readings per second, and Auto LevelPlex adds a cant sensor so a tilted rifle does not throw off longer shots.
Specifications
| Brand | Sig Sauer |
|---|---|
| Model | SIERRA3BDX |
| Dimensions & fit | |
| Objective Lens Diameter | 42 mmhigher than 58% of 309 rifle scopes |
| Construction & materials | |
| Material Type | Polymer |
| Color | Black |
| Compatibility & installation | |
| Mounting Type | Picatinny Mount, Weaver Mount |
| Compatible Devices | Rifle |
| Included components | |
| Unit Count | 2 |
| Other details | |
| Magnification Minimum | 3.5x |
| Magnification Maximum | 10x |
| Night vision | No |
| Product Style | Hunting |
| Sport Type | Hunting |
| Reticle Type | BDX R1 Digital |
Closest rivals on specs
Frequently asked questions
Does the Sierra3BDX scope work without the Kilo2800?
It works as a standard illuminated scope, but the BDX holdover dot only activates once paired with a Kilo BDX rangefinder over Bluetooth.
What is the rated range for the ballistic solution?
Sig lists the BDX-R1 reticle solution as accurate to about 800 yards at 1 MOA.
Is setup required before use?
Yes, both devices need the free Sig BDX app and a saved ballistic profile before the reticle shows correct holdover.