1. Introduzione
The Streamlight 88066 ProTac Rail Mount HL-X is a high-lumen, multi-fuel weapon-mounted light designed for rapid and secure attachment to MIL-STD-1913 rails on rifles, carbines, and submachine guns. This manual provides essential information for the proper setup, operation, and maintenance of your device.
This light offers versatile operation with either a remote pressure switch or a standard push-button tail switch. It supports dual-fuel technology, allowing operation with two CR123A lithium batteries or one Streamlight rechargeable SL-B26 battery.
2. Ciò chì hè in a scatula
Upon opening your package, verify that all the following components are included:
- Streamlight 88066 ProTac Rail Mount HL-X Weapon Light
- Interruttore di pressione à distanza
- Standard Push-Button Tail Switch
- Remote Retaining Clips & Mounting Hardware
- Two CR123A Batteries
- Guida d'usu

Figura 1: All components included with the Streamlight 88066 ProTac Rail Mount HL-X.
3. Setup
3.1. Installazione di batterie
The ProTac Rail Mount HL-X operates on either two CR123A lithium batteries or one Streamlight rechargeable SL-B26 battery. Ensure correct polarity when inserting batteries.
- Unscrew the tail cap from the main body of the light.
- Insert two CR123A batteries (positive end first) or one SL-B26 battery into the battery compartment.
- Replace the tail cap, ensuring it is tightened securely to maintain water resistance.

Figura 2: Battery installation for the ProTac Rail Mount HL-X.
3.2. Muntà a Luce
The integrated rail clamp allows for easy attachment to MIL-STD-1913 rails without requiring additional tools. The light comes with various keys to ensure compatibility with different rail systems.
- Loosen the thumbscrew on the rail clamp.
- Allineate u rail di a luce clamp with the desired slot on your MIL-STD-1913 rail.
- Push the light onto the rail until it seats firmly.
- Tighten the thumbscrew by hand until secure. For extra security, a flat-head wrench can be used with the provided groove.

Figura 3: ProTac Rail Mount HL-X mounted on a rail.
3.3. Attaching the Remote Pressure Switch
The remote pressure switch provides momentary and constant-on operation. Use the included retaining clips and mounting hardware to secure the switch and cable to your rail system.
- Replace the standard tail cap with the remote switch tail cap.
- Position the remote pressure switch on your rail in a comfortable and accessible location.
- Use the provided clips and screws to secure the pressure switch and route the cable along the rail, ensuring it does not interfere with weapon operation.

Figura 4: Remote pressure switch installation.
4. Operating Instructions
4.1. TEN-TAP Programming
The ProTac Rail Mount HL-X features TEN-TAP Programming, allowing you to select from three user-selectable programs:
- Prugramma 1 (Impostazioni di fabbrica): High / Strobe
- Prugramma 2: Solu altu
- Prugramma 3: Bassa / Alta
To change programs:
- Ensure the light is in the 'off' position.
- Tap the switch rapidly 9 times (within 0.4 seconds per tap).
- On the 10th tap, hold the switch down. The light will cycle through the available programs.
- Release the switch when the desired program is active. The light will flash to confirm the new program.
4.2. Switch Operation (Tail Switch & Remote Switch)
Both the standard push-button tail switch and the remote pressure switch offer similar functionality based on the selected TEN-TAP program.
- Momentary On: Press and hold the switch. Release to turn off.
- Constant On: Press the switch fully and release quickly. Press again to turn off.
- Strobe: Double-tap the switch quickly (if in Program 1).

Figura 5: ProTac Rail Mount HL-X in operation.
5. Funzioni chjave
- Emissione di lumen elevata: Delivers 1000 lumens for maximum illumination.
- Tecnulugia LED: White LED technology, impervious to shock with a 50,000-hour lifetime.
- TIR Optic: Produces a concentrated beam with optimum peripheral illumination.
- Capacità di Doppiu Carburante: Operates with two CR123A lithium batteries or one Streamlight rechargeable SL-B26 battery.
- Programmazione TEN-TAP: Offers three user-selectable operating modes (High/Strobe, High Only, Low/High).
- Pressostato à distanza: Features momentary and constant-on operation for tactical flexibility.
- Integrated Rail Clamp: Easily attaches to MIL-STD-1913 rails without tools for secure mounting.
- Custruzzione durabile: Made from 6000 Series machined aircraft aluminum with an impact-resistant tempered glass lens.
- Resistenza à l'acqua: IP67-rated (waterproof to 1 meter for 30 minutes) with standard push-button switch; IP54-rated (water-resistant) with remote pressure switch.

Figura 6: Overview di e caratteristiche è specifiche chjave.
6. Mantenimentu
The Streamlight ProTac Rail Mount HL-X is designed for durability and requires minimal maintenance. Regular cleaning and proper battery management will ensure optimal performance.
- Pulizia: Asciugà u lume cun un soffiu, damp pannu per caccià a terra è i detriti. Evitate i detergenti abrasivi.
- Sustituzione di batterie: Replace batteries as needed. Always use fresh, high-quality batteries.
- Anelli O: Periodically inspect O-rings for wear and tear. Lubricate with silicone grease if necessary to maintain water resistance.
7. Risoluzione di prublemi
If your Streamlight ProTac Rail Mount HL-X is not functioning as expected, consider the following common issues:
- Luce chì ùn si accende micca: Ensure batteries are correctly inserted with proper polarity and are not depleted. Check that the tail cap is fully tightened.
- Operazione intermittente: Verify that the tail cap and any remote switch connections are secure. Clean battery contacts if necessary.
- Dim Light Output: Replace batteries with fresh ones. Dim output often indicates low battery power.
If issues persist, refer to the warranty and support section for further assistance.
8. Specificazioni
| Feature | Detail |
|---|---|
| Numero di mudellu | 88066 |
| Emissione luminosa massima | 1000 lumens |
| Luminosità | 50,000 Candela |
| Distanza di fasciu | 447 Meters (High) |
| Fonte d'energia | Battery Powered (2x CR123A or 1x SL-B26) |
| A cumpusizioni di a batteria | Lithium |
| Tipu di fonte di luce | LED |
| Materiale | Aluminum (6000 Series machined aircraft) |
| Culore | Neru |
| Dimensioni di u produttu | 5.43 "D x 1.45" W x 1.72 "H |
| Pesu di l'articulu | 6.4 once |
| Livellu di resistenza à l'acqua | IP67 (standard switch), IP54 (remote switch) |
| Funzione speciale | High Power, Impact Resistant |
9. Garanzia è Supportu
The Streamlight 88066 ProTac Rail Mount HL-X comes with a Garanzia à vita. For warranty claims, technical support, or any questions regarding your product, please contact Streamlight customer service directly.
Visit the official Streamlight website or refer to the contact information provided in your product packaging for the most up-to-date support details.





