Pre-owned Sig Sauer Sierra3 BDX 4.5-14x44 Rifle Scope - PO2145
- Patented Ballistic Data Xchange (BDX) system with Bluetooth connectivity synchronizes in real time with SIG SAUER BDX-enabled KILO rangefinders for automatic ballistic compensation
- Second focal plane optical design with a 4.5–14x magnification range and a 44mm objective
- BDX1-R1 digital ballistic reticle provides an illuminated, auto-adjusting holdover point based on ranged distance and stored ballistic profiles
Condition: Good
This unit remains in good overall condition with signs of prior use.
This product comes with bikini covers and a lens cloth.
NO OTHER ACCESSORIES INCLUDED.
These products are sold in accordance with the VAT margin scheme for second-hand goods.
The SIG SAUER SIERRA3 BDX is integrating the patented Ballistic Data Xchange (BDX) system for digitally assisted ballistic solutions. The scope features Bluetooth connectivity, enabling real-time synchronization with SIG SAUER BDX-enabled KILO laser rangefinders to deliver instant ballistic compensation based on measured distance and stored ballistic profiles.
Constructed on a 30mm aluminum main tube, the SIERRA3 BDX utilizes a second focal plane optical system with 0.25 MOA elevation and windage adjustments for precise zeroing and repeatable corrections. The BDX1-R1 digital ballistic reticle provides an electronically illuminated, auto-adjusting holdover point that dynamically updates after ranging, eliminating the need for manual DOPE calculations or turret dialing.
Optical performance is enhanced through SIG SAUER’s SpectraCoat lens coatings for improved light transmission, contrast, and edge-to-edge clarity. The integrated LevelPlex digital anti-cant system minimizes cant-induced ballistic error, while the KinETHIC energy indicator displays estimated on-target kinetic energy to assist with ethical shot decisions. A side-focus parallax adjustment ensures precise target resolution across varying distances.
When paired with a compatible BDX rangefinder, the operational workflow is streamlined: range the target, align the illuminated ballistic hold point, and engage. The SIERRA3 BDX delivers a technically advanced, electronically assisted shooting solution within a conventional riflescope platform.
| Magnification | 4.5-14x |
| Objective Lens Diameter | 50 mm |
| Overall Length | 12.8 in |
| Weight | 24.9 |
| Illumination Settings | 10 Daylight |
| Maintube Diameter | 30mm |
| Total Elevation Travel | 55 MOA |
| Total Windage Travel | 55 MOA |
| Travel Per Rotation | 20 MOA |
| Parallax Setting | 100 Yards |
| Eye Relief Low (IN) | 4.21 |
| Eye Relief High (IN) | 3.35 |
| Field of View Low (FT @ 100 Yards) | 19.9 |
| Field of View High (FT @ 100 Yards) | 6.7 |
| Diopter Adjustment Range | ± 2 |
| Internal Gas Purge | Nitrogen |
| Objective Outer Diameter | 2.3 |
| Ocular Outer Diameter (in) | 1.61 |
| Color | Black |
| Mount Included | No |
| Battery | (2) CR2032 |
| Focal Plane | Second |
| Reticle | BDX-R1 Digital |
| Illumination | Yes |
- Integrated BDX Ballistic Data Xchange. A rangefinder and riflescope system that uses ballistics, environmental conditions and Bluetooth® to illuminate the exact holdover dot.
- Automatic holdover dot on a Digital Focal Plane, combining Second Focal Plane stadias, with an OLED illuminated ballistic holdover dot that automatically scales with zoom to subtend on target at any magnification level.
- Features our MOTAC (Motion Activated Illumination) that powers up when it senses motion and powers down when it does not. Provides for optimum operational safety and enhanced battery life.
- Spectracoat highly efficient, ultra-wide broadband, anti-reflection lens coatings reduce surface reflections to extremely low levels across the entire visible spectrum providing superior light transmission.
- SIG SAUER’s innovative KinETHIC kinetic energy transfer indicator. KinETHIC provides assistance in assuring an ethical hunt by indicating when energy on target drops below a threshold that can be set by the hunter using the SIG BDX App.
- New for BDX riflescopes, Auto LevelPlex, automatically increases digital level sensitivity on longer shots.
- Dependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance.
Pre-owned Sig Sauer Sierra3 BDX 4.5-14x44 Rifle Scope - PO2145
This product comes with bikini covers and a lens cloth.
NO OTHER ACCESSORIES INCLUDED.
- OPW 12-Month Warranty
Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means.
Please Note: Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.
Please Note: DPD SHIPMENTS REQUIRE THE CUSTOMER TO SHOW A PIN CODE ON DELIVERY - READ MORE: HERE
COURIERS
![]() |
![]() |
![]() |
![]() |
We use DPD , RoyalMail, TNT and UPS courier services for all our orders whether dispatching to the UK or International. As soon as your order has been dispatched you will receive an email with your unique tracking number. We are unable to add delivery notes to your order regarding safe spaces or neighbour deliveries. If you require this service it can be arranged directly with the courier once the parcel is in their network.
IN-STORE ITEMS
These are items that we have in-stock and will be sent out for delivery as soon as possible. We aim to dispatch all orders within 1-2 working days, but during busy periods dispatch may be delayed by a day or so. If you would like to purchase the item in person then please call ahead to arrange an appointment: 01803 611 895.
PRE-ORDER ITEMS
These are usually items that are going to be out-of-stock for a number of weeks or are in short supply. By purchasing a Pre-Order Item you are in effect paying a deposit for your goods. As soon as the item is back in stock yours will be dispatched within 24 hours where possible. Please see individual product pages for current back-in-stock dates. In rare occasions, these dates can be changed by the manufacturers so we recommend staying in contact with Optics Warehouse depending on the product lead time.
INTERNATIONAL DELIVERY & TAXES
In addition to the above information If your delivery address is outside of the UK you may be subject to import duties and taxes, which are levied once a shipment reaches your country. Any such additional charges for customs clearance must be borne by you. You should note that customs policies vary widely from country to country. Optics Warehouse advises each customer to contact their local customs office for further information if they are in any way unsure of local duties or liabilities. Cross border shipments are subject to opening and inspection by customs authorities which means some packages may be opened and re-sealed.
NEED HELP?
If you require any further assistance, please call us on 01803 611 895 or email sales@opticswarehouse.co.uk
-
A NOTE ABOUT DPD SHIPMENTS:
- Please be advised that we have now introduced DPD Pins to all DPD orders from Optics Warehouse.
- If your shipment is being sent from Optics Warehouse via DPD you will be sent a Pin Code that must be shown to the courier upon delivery.
- The pincode is sent VIA email & TEXT message. A valid email address and mobile number must be provided at checkout. Emails will be sent from "Riviera House 3PL" - if you do not receive this email please check your junk or spam folders.
- Please note that if you do not display your pin code to the courier driver upon delivery, you will not be able to have your item and you may need to schedule another delivery date to show a valid pin.
- Please view the attached slides HERE for further information!










