This might surprise you all but Polymer lowers aren’t as strong as PSA lowers

Published on May 2, 2023
Duration: 0:34

This video demonstrates that polymer AR-15 lower receivers are significantly less durable than aluminum ones, failing under a single impact. An aluminum PSA lower receiver withstood repeated heavy impacts against a wooden post without functional compromise. The speaker highlights that the small cost difference ($20) makes aluminum a superior choice for durability.

Quick Summary

Polymer AR-15 lower receivers are demonstrably less durable than aluminum ones, failing under single impacts. An aluminum PSA lower receiver withstood repeated heavy impacts, proving its superior strength for only a $20 price increase.

Chapters

  1. 00:00Polymer Lower Failure Demonstration
  2. 00:04Aluminum PSA Lower Durability Test
  3. 00:19Cost-Benefit: Aluminum vs Polymer

Frequently Asked Questions

Are polymer AR-15 lower receivers weaker than aluminum ones?

Yes, this video demonstrates that polymer AR-15 lower receivers can be significantly weaker. A polymer lower failed under a single impact, while an aluminum PSA lower receiver withstood repeated heavy impacts and remained functional.

What is the typical cost difference between polymer and aluminum AR-15 lowers?

The speaker notes that an aluminum lower receiver is typically only about $20 more expensive than a comparable polymer lower receiver. This small price difference is argued to be well worth the significant increase in durability.

Where do polymer AR-15 lowers typically fail under stress?

In the demonstration, the polymer AR-15 lower receiver failed at the buffer tube extension. This area is critical for the structural integrity of the rear of the receiver.

Is an aluminum lower receiver worth the extra cost over a polymer one?

Based on the demonstrated durability difference, the speaker suggests an aluminum lower is worth the approximately $20 premium. It offers substantially greater resilience against impacts and stress.

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