Polymer 80 Trigger Reset Problem

Published on January 17, 2019
Duration: 6:30

This guide details how to diagnose and fix a common Polymer 80 trigger reset issue. It involves careful disassembly, inspection of the rear rail for machining defects, and precise sanding with a Dremel tool. The process concludes with reassembly and rigorous testing, both dry-fire and live-fire, to ensure a reliable trigger reset. This instructional content is presented by an experienced DIY firearm builder.

Quick Summary

A common Polymer 80 trigger reset problem is caused by rough machining and metal burrs on the rear rail insert, which impede the trigger bar's movement. The fix involves careful disassembly, smoothing these imperfections with a Dremel tool on low speed, reassembly, and thorough dry-fire and live-fire testing.

Chapters

  1. 00:00Problem Demonstration
  2. 00:35Disassembly Process
  3. 01:40Identifying the Root Cause
  4. 03:10Corrective Sanding
  5. 04:44Reassembly and Testing
  6. 06:12Range Validation

Frequently Asked Questions

What causes a Polymer 80 trigger to fail to reset?

A common cause for a Polymer 80 trigger failing to reset is rough machining or metal burrs on the rear rail insert. These imperfections can catch on the trigger bar, preventing it from completing its cycle and resetting for the next shot.

How can I fix a Polymer 80 trigger reset problem?

To fix a Polymer 80 trigger reset issue, carefully disassemble the firearm, inspect the rear rail insert for burrs, and use a Dremel tool on a low speed with a sanding drum to smooth the affected areas. Reassemble and test thoroughly.

What tools are needed to repair a Polymer 80 trigger reset?

Essential tools for repairing a Polymer 80 trigger reset problem include a Dremel rotary tool with a sanding drum attachment, a brass or nylon hammer, and a steel punch for frame pin removal. Proper disassembly and reassembly knowledge is also key.

Is it safe to modify my Polymer 80 build with a Dremel?

Modifying your Polymer 80 build with a Dremel requires caution and precision. Always ensure the firearm is unloaded, work slowly, and focus on smoothing rough areas without removing excessive material. Test functionality thoroughly after modification.

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