This AR-15 Shouldn’t Exist…But It Does! | US Palm STORM CAT4

Published on April 15, 2026
Duration: 18:45

This review of the US Palm CAT4 Storm AR-15 highlights its unique origin from an AK accessories manufacturer. The firearm features a distinctive Hurricane muzzle device, a 16-inch chrome moly barrel with a 1:7 twist, and a mid-length gas system. The reviewer praises the ambidextrous controls, flared magwell, and the Hyperfire EDT trigger, while noting potential concerns with the charging handle's gas mitigation and the low-profile ambi magazine release. Overall, it's presented as a feature-rich AR-15 with a competitive price point.

Quick Summary

The US Palm CAT4 Storm AR-15 stands out as it's produced by an AK accessories manufacturer. It boasts a unique Hurricane muzzle device, a 16-inch barrel with a 1:7 twist, and a mid-length gas system. The rifle is equipped with full ambidextrous controls, a flared magwell, and a Hyperfire EDT trigger, offering significant features for its price point.

Chapters

  1. 00:48Introduction: An AK Company Makes an AR
  2. 01:37Hurricane Muzzle Device Analysis
  3. 03:03Barrel and Gas System Specs
  4. 03:30M-LOK Handguard and Monolock System
  5. 06:00Upper and Lower Receiver Construction
  6. 06:20Ergonomics: Flared Magwell
  7. 07:11Ambidextrous Controls Deep Dive
  8. 09:08Ambi Bolt Release and Catch
  9. 10:32Removable Forward Assist Discussion
  10. 12:09Charging Handle and Gas Mitigation
  11. 13:33Hyperfire EDT Trigger Performance
  12. 14:41US Palm Grip and Magpul Stock
  13. 16:04Overall Impressions and Value
  14. 17:19Viewer Feedback and Future Testing

Frequently Asked Questions

What makes the US Palm CAT4 Storm unique?

The US Palm CAT4 Storm is unique because it's manufactured by US Palm, a company primarily known for AK accessories, marking their significant entry into the AR-15 platform with a feature-rich design.

What are the key features of the US Palm CAT4 Storm's muzzle device?

The CAT4 Storm features the 'Hurricane' muzzle device, a distinctive three-prong design with a twist. It functions as both a flash hider and a compensator, with ports at the 12:00 position designed to mitigate muzzle rise and felt recoil.

How does the US Palm CAT4 Storm handle ambidextrous controls?

The rifle offers 100% complete ambidextrous controls, including the safety selector, bolt release, and magazine release. The ambi bolt release is particularly praised for its ease of use, even with gloves.

What is the barrel and gas system configuration of the US Palm CAT4 Storm?

It features a 16-inch chrome moly barrel with a 1:7 twist rate and a mid-length gas system. The mid-length system is favored for its balance of reliability and smoother operation by reducing gas and pressure.

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