Duality Arms RATL-R Trigger Installation for Kriss Vector Made Easy!!!

Published on November 16, 2025
Duration: 9:45

This video provides a comprehensive, step-by-step guide on how to install the Duality Arms RATL-R trigger upgrade for the Kriss Vector. The instructor, from the Muzzle Bro channel, details the disassembly of the trigger pack, removal of the factory sear, installation of the Rattler sear, and reassembly of the trigger pack and firearm. The guide emphasizes careful handling of small parts and includes crucial function checks to ensure proper installation.

Quick Summary

To install the Duality Arms RATL-R trigger on a Kriss Vector, first separate the upper and lower receivers and remove the trigger pack. Disassemble the trigger pack by carefully removing internal roll pins, then replace the factory sear with the Rattler sear. Reassemble the trigger pack, ensuring all components are correctly seated, and perform function checks before reinstalling it into the firearm.

Chapters

  1. 00:00Introduction & Overview
  2. 00:09Firearm Disassembly: Upper/Lower Separation
  3. 00:24Removing Safety Selectors & Ejection Port
  4. 00:47Removing Top Rail
  5. 00:58Removing Trigger Pack
  6. 01:14Trigger Pack Disassembly: Internal Components
  7. 02:13Preparing Trigger Pack Housing
  8. 02:30Installing Duality Arms Rattler Components
  9. 03:13Removing Factory Sear
  10. 03:31Installing Rattler Sear
  11. 03:40Reassembling Trigger Pack: Safety Cam & Main Spring
  12. 04:58Reassembly: Spacers, Sear, Disconnector
  13. 06:18Reassembly: Hammer, Springs, and Pins
  14. 07:02Final Spring Adjustment & Function Check
  15. 08:23Reinstalling Trigger Pack into Kriss Vector
  16. 08:33Reassembling Firearm: Top Rail, Safety Selectors
  17. 09:01Final Assembly: Upper/Lower Receiver
  18. 09:05Final Function Check: Safe, Semi, Rattler Modes
  19. 09:29Conclusion & Outro

Frequently Asked Questions

What are the main steps to install the Duality Arms RATL-R trigger on a Kriss Vector?

The installation involves separating the upper and lower receivers, removing the trigger pack, disassembling the trigger pack by removing internal roll pins, replacing the factory sear with the Rattler sear, reassembling the trigger pack with new components, and then reinstalling the trigger pack and reassembling the firearm. Crucial function checks are performed throughout.

What tools are needed for the Duality Arms RATL-R trigger installation on a Kriss Vector?

Essential tools include an Allen wrench for safety selectors, a punch set and rubber mallet for roll pins, needle-nose pliers for some components, a pick tool for fine adjustments, and Loctite for reassembly of certain parts.

How do you ensure the Duality Arms RATL-R trigger is installed correctly in a Kriss Vector?

Correct installation is confirmed through multiple function checks. After trigger pack reassembly, test the hammer and trigger reset. After the firearm is fully reassembled, test the safety selector in safe (should not fire), semi-auto (should fire), and Rattler mode (should fire).

What are common mistakes to avoid during the Kriss Vector Duality Arms trigger upgrade?

Avoid losing small internal components like springs and spacers during trigger pack disassembly. Be careful not to over-torque safety selector screws into the polymer receiver. Ensure the main spring's long leg is correctly seated during reassembly for proper trigger function.

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