AK BOLT AND TRUNNION WEAR - WHAT TO EXPECT

Published on June 5, 2018
Duration: 7:08

This video from Palmetto State Armory demonstrates the typical wear patterns expected on an AK-47's bolt and trunnion after firing approximately 1000 rounds. It highlights that minor wear and polishing on the bolt lugs and trunnion are normal during the break-in process and do not indicate a compromised rifle. The process involves using headspace gauges to track changes as rounds are fired.

Quick Summary

Minor wear and polishing on an AK-47's bolt lugs and trunnion are normal during the break-in process, indicating proper function. Headspace measurements using go/no-go gauges track this progression, which typically stabilizes after around 1000 rounds.

Chapters

  1. 00:07Introduction to Bolt and Trunnion Wear
  2. 00:27Understanding Bolt and Trunnion Wear
  3. 00:56Headspacing Explained
  4. 01:13Comparing New vs. Used Bolts
  5. 01:30Initial Headspace Measurement
  6. 02:25After 100 Rounds: Wear and Headspace Check
  7. 03:54Headspace Check After More Rounds
  8. 04:33Visualizing Bolt-Trunnion Interface
  9. 05:17Headspace Check at 500-750 Rounds
  10. 06:02Final Headspace Check at 1000 Rounds
  11. 06:18Rifle Considered Broken-In
  12. 06:43Palmetto State Armory Warranty

Frequently Asked Questions

Is wear on an AK-47 bolt and trunnion normal?

Yes, minor wear and polishing on the bolt lugs and trunnion of an AK-47 are completely normal during the break-in process. This indicates the rifle is functioning as designed and does not necessarily mean there is an issue with its integrity.

How do you measure the break-in progress of an AK-47?

The break-in progress of an AK-47 can be tracked by measuring its headspace using go/no-go gauges. By firing rounds in increments and re-measuring, you can observe how the headspace changes as the bolt and trunnion wear in.

What is the typical headspace progression for an AK-47 during break-in?

A new AK bolt might start with a headspace that closes on a 'go' gauge but not a '3' gauge. After 100 rounds, it might close on a '4' gauge. By 500-750 rounds, it could close on a '5' gauge, and after 1000 rounds, it's considered broken-in with a stable headspace.

What causes wear on an AK-47's bolt and trunnion?

The wear on an AK-47's bolt and trunnion is caused by the bolt lugs rolling over the trunnion as the rifle cycles. This is a natural part of the firearm's operation and break-in period, leading to a polished surface over time.

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