Motorola RS419 Quick Reference Manual page 8

Release Tab
2. Slide the finger strap assembly out of the trigger assembly.
3. Align a new finger strap assembly with the slot in the trigger assembly.
4. Push the finger strap assembly into the trigger assembly until the release tab clicks into place.
5. Insert your index finger through the finger strap. Tighten the strap and press the hook and pile
together.
6. If required, cut excess finger strap material.