This Almost DESTROYED My AR Pistol Build

Published on November 9, 2021
Duration: 21:17

This guide details advanced troubleshooting for AR-15 pistol gas system issues, specifically addressing under-gassing and bolt lock-back failures. It covers component swaps like triggers and BCGs, and a DIY method for correcting gas port misalignment using digital calipers and grinding techniques. The speaker, demonstrating high technical authority, emphasizes precision measurement and component compatibility.

Quick Summary

Troubleshooting AR pistol gas system issues involves diagnosing under-gassing and hammer follow. A common fix for misalignment is grinding the gas block adjustment ring on concrete after measuring with calipers. Swapping triggers and using lighter BCGs can also improve reliability.

Chapters

  1. 00:00Introduction: AR Pistol Build Failure
  2. 01:26Key Components: Gridlock Rail & PDW Brace
  3. 02:31Troubleshooting: Cycling & Hammer Follow Issues
  4. 05:14Trigger & BCG Swap for Reliability
  5. 09:12Root Cause: Gas Port Misalignment Diagnosis
  6. 11:13DIY Fix: Grinding Gas Block Adjustment Ring
  7. 14:59Optics & Magazine Compatibility Test

Frequently Asked Questions

What causes an AR pistol to fail to lock back on the last round?

Failure to lock back typically indicates an under-gassed system. This can be caused by a misaligned gas block, incorrect gas port size, or excessive friction in the action, such as a heavy bolt carrier group or tight tolerances.

How can I fix hammer follow in my AR-15 build?

Hammer follow often stems from trigger group tolerance issues with the receiver or a weak hammer spring. Swapping to a known-good, high-quality trigger like a Geissele SD-3G can resolve this safety hazard.

What is the best way to diagnose gas system problems in an AR pistol?

Start by verifying trigger function. If cycling issues persist, inspect the gas block alignment using calipers. Consider reducing reciprocating mass with a lighter BCG if the system remains under-gassed after confirming proper gas port alignment.

Can I fix a misaligned gas block myself?

Yes, a temporary fix involves carefully grinding the rear of the gas block's adjustment ring on a flat, abrasive surface to achieve proper alignment with the barrel's gas port. Ensure the firearm is unloaded and wear safety glasses during this process.

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