How To Install Surefire 640 Dual Fuel Turbo Scout Pro Swivel Tactical Weapon Mounted Flashlight

Published on May 2, 2024
Duration: 5:19

This guide details the installation of the Surefire 640 DFT Scout Pro tactical flashlight onto an M-LOK handguard. It covers proper screw insertion, M-LOK tab orientation, torque specifications for metal and polymer handguards (30 in-lbs and 15 in-lbs respectively), and crucial visual checks to ensure secure and safe mounting. The video emphasizes achieving optimal light placement for weapon control and comfort.

Quick Summary

Install the Surefire 640 DFT Scout Pro light by ensuring M-LOK tabs are vertical and torquing screws to 30 in-lbs for metal or 15 in-lbs for polymer handguards. Proper placement balances weapon control with comfort, and the Dual Fuel Turbo feature allows use of 18650 or CR123A batteries.

Chapters

  1. 00:00Introduction to Surefire 640 DFT Scout Pro
  2. 00:20Removing Old M-LOK Accessory
  3. 00:43Orienting and Inserting New Light Screw
  4. 01:24Initial Hand Tightening and Placement
  5. 02:15Engaging M-LOK Slots
  6. 02:47Alternating Screw Tightening
  7. 02:53Torque Specifications for Metal vs. Polymer
  8. 03:33Verifying M-LOK Tab Orientation
  9. 03:50Installing Battery and Flashlight Head
  10. 04:09Final Light Positioning and Tightening
  11. 04:46Conclusion and Outro

Frequently Asked Questions

What are the correct torque specifications for installing the Surefire 640 DFT Scout Pro on an M-LOK handguard?

For metal M-LOK handguards, torque the mounting screws to 30 inch-pounds. If you are using a polymer or plastic handguard, the torque specification is reduced to 15 inch-pounds to prevent damage.

How do I ensure the M-LOK mounting tabs are correctly installed on my handguard?

After initial tightening, visually inspect the M-LOK tabs from behind the handguard. They must be perfectly vertical, not canted or at an angle, to properly engage the slots and prevent damage.

Where is the optimal placement for a weapon-mounted light like the Surefire 640 DFT Scout Pro?

The ideal placement is typically as far forward on the barrel as your grip allows, balancing increased weapon control with the ability to still pull the rifle firmly into your shoulder.

What type of batteries does the Surefire 640 DFT Scout Pro Dual Fuel Turbo light use?

The 'Dual Fuel Turbo' designation means this light is versatile and can be powered by either a standard 18650 rechargeable battery or a CR123A disposable battery, offering flexibility in the field.

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