What is a BUFFER TUBE?

Published on March 11, 2026
Duration: 1:30

This video from GUNBROS explains the function of a buffer tube on an AR-15 or AR-pattern rifle. As demonstrated by the instructor, the buffer tube is attached to the lower receiver and houses the buffer and spring. When the rifle fires, the bolt carrier group compresses this assembly, which then returns forward to chamber the next round. The video emphasizes the critical role of the buffer tube in the AR-15's operating system.

Quick Summary

The buffer tube on an AR-15 or AR-pattern rifle is attached to the lower receiver and contains the buffer and spring. This assembly is compressed by the bolt carrier group when the gun fires, and the spring's subsequent expansion drives the BCG forward to chamber a new round.

Chapters

  1. 00:00Introducing the Buffer Tube Question
  2. 00:16Defining the Buffer Tube
  3. 00:34Internal Components and Function
  4. 01:07Importance and Compatibility
  5. 01:20Humorous Conclusion

Frequently Asked Questions

What is the primary function of a buffer tube on an AR-15?

The buffer tube on an AR-15 or AR-pattern rifle houses the buffer and spring. When the rifle fires, the bolt carrier group compresses this assembly, and the spring's expansion then drives the bolt carrier group forward to chamber the next round.

Where is the buffer tube located on an AR-15?

The buffer tube is attached to the lower receiver of an AR-15 or AR-pattern rifle. It's a key external component that is integral to the firearm's cycling and operating system.

Are buffer tubes used in all types of rifles?

No, not all operating systems require a buffer tube. However, it is a critical and defining component for AR-15 and AR-pattern rifles, essential for their direct impingement or gas-operated cycling mechanism.

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