1. Product Overview
The DEFENTAC DF51 is a 350-lumen pistol light and green laser combo designed to enhance visibility and targeting for compatible firearms. It features multiple tactical modes, magnetic recharging, and a durable polymer construction.
Compatibility
This device is exclusively compatible with Sig Sauer P365, P365X, and P365XL pistols. It is not compatible with P365 X-Macro or other pistol models.
What's in the Box
- Green Laser Light Combo
- Charging Cable
- Spare Screws (1 set)
- Allen Tools (2 pieces)
- User Manual
2. Setup and Installation
Follow these steps to properly install your DEFENTAC DF51 Pistol Light Green Laser Combo:
- Separate Housings: The light comes with two separated housings. Identify the flashlight side and the empty side.
- Slide Empty Side: Slide the empty side housing over the trigger guard of your compatible pistol until it snaps into place.
- Hook Flashlight Side: Hook the flashlight side housing into the empty side. Apply pressure from both sides to join the housings together securely.
- Insert and Tighten Screws: Insert the provided screws from the flashlight side. Use the included Allen key to tighten the screws. Do not over-tighten to avoid damaging the housing.

Image: The DEFENTAC DF51 mounted on a pistol, demonstrating its precise fit.
Video: A detailed guide on how to install the DEFENTAC 350lm laser light combo on your pistol.
Video: Instructions on inserting screws from the flashlight side and the importance of not over-tightening.
3. Operating Instructions
Power Switch
The device features an independent main power switch. Turn this switch to the 'On' position to activate the unit. To extend standby time and prevent accidental operation, turn the main switch to 'Off' when not in use.
Tactical Modes
The DEFENTAC DF51 offers three tactical modes, accessible via the ambidextrous buttons:
- Constant On: Provides continuous light or laser output.
- Momentary On: Activates light or laser only while the button is pressed.
- Strobe: Emits a flashing light or laser pattern.

Image: Illustration of the three tactical modes: Laser, Flashlight, and Laser & Flashlight combined.
Adjusting Windage and Elevation
The green laser sight is adjustable to maintain zero. Slowly tune the elevation and windage interactively using the included Allen key. Adjusting in only one direction excessively may lock or damage the threads.

Image: Diagram highlighting the location of the elevation and windage adjustment screws, along with other controls.
4. Maintenance and Charging
Magnetic Recharging
The DEFENTAC DF51 features a convenient magnetic recharging system. This allows you to recharge the device without disassembling it or removing it from your pistol, helping to maintain zero. Simply attach the included magnetic charging cable to the charging port.

Image: The magnetic charging feature of the DEFENTAC DF51, showing the charging cable connected.
Battery Life
- Flashlight only: Approximately 60 minutes
- Green laser only: Approximately 6 hours
The device uses 1 included Lithium Polymer battery.
5. Specifications
| Feature | Detail |
|---|---|
| Model Number | DF-51 |
| Brightness | 350 Lumens |
| Light Source Type | LED |
| Laser Output | <5mW, Class IIIA |
| Material | Nylon Reinforced Fiber (Polymer) |
| Product Dimensions | 2.5"D x 1.1"W x 1.7"H |
| Item Weight | 45 Grams (1.59 ounces) |
| Battery Type | Lithium Polymer (included) |
| Waterproof Rating | IPX4 |

Image: Key specifications and features of the DEFENTAC DF51, including dimensions and performance metrics.
6. Troubleshooting
Laser Not Holding Zero
If the laser sight is not holding its zero, ensure that the elevation and windage adjustment screws are properly tightened. Make small, interactive adjustments to both screws using the provided Allen key. Avoid over-tightening or adjusting only one screw excessively, as this can damage the mechanism.
Device Not Powering On
- Check the main power switch to ensure it is in the 'On' position.
- Ensure the battery is charged. Connect the magnetic charging cable and check the charging indicator.
7. Warranty and Support
Warranty Information
The DEFENTAC DF51 comes with a Limited Warranty. For specific terms and conditions, please refer to the warranty card included with your product or contact DEFENTAC customer service.
Customer Support
For further assistance, product inquiries, or technical support, please visit the official DEFENTAC Store on Amazon: DEFENTAC Store