Quick Tip: Must-Have Spare Parts for Your AR-15

Published on April 1, 2020
Duration: 11:01

This guide, based on expert advice from Brownells, details essential spare parts for the AR-15 platform. It covers critical components like gas rings, extractor springs, firing pin retaining pins, and buffer springs, emphasizing their wear patterns and maintenance. The guide also touches on lower receiver parts and the importance of retaining original components when using aftermarket triggers.

Quick Summary

Brownells experts identify gas rings and buffer springs as the most common AR-15 parts to wear out. They also stress the importance of spare small parts like firing pin retaining pins and cam pins. Measuring buffer springs (min 10 1/16" for carbine, 11 1/4" for rifle) helps determine replacement needs. Retaining original mil-spec trigger parts is advised when using aftermarket triggers.

Chapters

  1. 00:00Introduction to AR-15 Spare Parts
  2. 01:14Bolt Carrier Group (BCG) Components
  3. 02:47Barrel Length and Part Wear
  4. 03:38Small, Easy-to-Lose Parts
  5. 05:21Lower Receiver Maintenance
  6. 06:40Buffer Spring Specifications
  7. 08:40Custom and Boutique Parts

Frequently Asked Questions

What are the most common AR-15 parts that wear out?

According to Brownells experts, the two primary AR-15 components that wear out through normal use are gas rings and buffer springs. These parts are crucial for the firearm's operation and should be inspected periodically.

Why is it important to keep spare small parts for an AR-15?

Small, inexpensive parts like firing pin retaining pins (cotter pins) and cam pins are critical for the Bolt Carrier Group's function. They are easily lost during maintenance, making spares essential to prevent a firearm from becoming inoperable.

How can I check if my AR-15 buffer spring needs replacement?

You can check if your AR-15 buffer spring needs replacement by measuring its length. For a carbine buffer spring, the minimum serviceable length is 10 1/16 inches. For a rifle buffer spring, it's 11 1/4 inches.

Should I keep original parts if I install an aftermarket AR-15 trigger?

Yes, it is highly recommended to keep your original mil-spec trigger components as backups. If a specialized aftermarket trigger from brands like Elftmann or Timney fails, having the original parts ensures you can quickly restore the firearm's functionality.

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