Should You Buy a Polymer AR15 Lower | Polymer VS Aluminum Lower Receiver Test | We Break Stuff Again

Published on May 6, 2023
Duration: 17:29

This video tests the durability of polymer AR-15 lower receivers against an aluminum counterpart. The primary failure point identified for polymer lowers is the threaded buffer tube receiver area, which can strip or crack under stress. While polymer lowers are significantly cheaper, the testing demonstrates a substantial compromise in robustness compared to aluminum receivers, making them unsuitable for demanding use or abuse.

Quick Summary

The primary failure point for polymer AR-15 lower receivers is the threaded area for the buffer tube. This plastic component is prone to stripping or cracking under stress, unlike more robust aluminum receivers, making polymer options less durable for demanding use.

Chapters

  1. 00:46Introduction: Polymer Lower Receiver
  2. 01:17Why Buy a Polymer Lower?
  3. 02:20Polymer Lower Receiver Design
  4. 04:43Initial Firing Test
  5. 08:17Durability Concerns: Polymer Lower
  6. 09:21Common Failure Point: Buffer Tube Threads
  7. 10:30Lower Receiver Cracks
  8. 12:07Aluminum Lower Receiver Abuse Test
  9. 13:01Channel Support & Legal Issues
  10. 14:17Closing Thoughts & Recommendations

Frequently Asked Questions

What is the main failure point of polymer AR-15 lower receivers?

The most common failure point for polymer AR-15 lower receivers is the threaded area where the buffer tube attaches. This plastic component is susceptible to stripping or cracking under stress, unlike its aluminum counterpart.

Are polymer lower receivers as durable as aluminum ones for AR-15s?

No, polymer lower receivers are significantly less durable than aluminum ones. While cheaper, they are prone to critical failures, especially around the buffer tube threads, making them unsuitable for demanding use or abuse.

Why would someone choose a polymer AR-15 lower receiver?

The primary reason people choose polymer AR-15 lower receivers is their lower cost. They can be significantly cheaper than aluminum receivers, making them an attractive option for budget-conscious builders.

What is the price difference between polymer and aluminum AR-15 lower receivers?

Polymer lower receivers can be found for around $39, whereas aluminum lowers typically range from $50 to $100. This difference of $11 to $61 often leads consumers to opt for the cheaper polymer option.

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