US Palm New AR15 | Storm CAT4 (FIRST LOOK)

Published on April 11, 2026
Duration: 15:45

This is a first look review of the US Palm Storm Cat4 AR-15, highlighting its unique features aimed at an affordable duty-style rifle. The review covers the innovative monolock handguard system, user-serviceable internal components, ambidextrous lower receiver controls, and the cold hammer-forged barrel. The presenter, a firearms instructor, provides insights into the rifle's performance after 150-200 rounds, noting reliability and specific design choices.

Quick Summary

The US Palm Storm Cat4 AR-15 is an affordable duty-style rifle under $1300, featuring a proprietary Monolock system for a true free-float barrel and user-serviceable internal components like a steel cam path insert to prevent charging handle reciprocation. It demonstrated reliability with no malfunctions over 150-200 rounds.

Chapters

  1. 00:00Introduction to US Palm Storm Cat4
  2. 00:20Affordable Duty-Style Rifle Concept
  3. 00:33Testing and Reliability
  4. 00:58Storm Cat4 Naming and Lineup
  5. 01:17Monolock System Breakdown
  6. 01:48Upper Receiver Construction (Extruded 7075)
  7. 01:57User-Serviceable Bolt Catch/Deflector
  8. 02:20Transparency and Channel Support
  9. 03:37User Serviceable Cam Path and Charging Handle Pin
  10. 04:43Lower Receiver Features
  11. 04:50Ambidextrous Magazine Release Precision
  12. 05:27Bolt Release and Magwell
  13. 06:13Ambidextrous Safety Selector (45 Degree Throw)
  14. 06:53Bolt Carrier Group (BCG) Specs
  15. 07:03Handguard and Monolock Downsides
  16. 07:52Barrel Specifications
  17. 07:56Muzzle Device Analysis
  18. 09:30Suppressor Performance and Gas System
  19. 10:05Receiver Tensioning System
  20. 10:13Specialized Setup Explanation (DNT NVM D)
  21. 11:26Accuracy Test Introduction
  22. 11:40Future of the Storm Cat Line
  23. 12:21Ambidextrous Charging Handle
  24. 12:39Conclusion and Purchase Decision
  25. 13:20Sponsor Mentions (Howitzer Clothing)
  26. 13:34Inspirational Message (Gratification)

Frequently Asked Questions

What is the US Palm Storm Cat4 AR-15 designed for?

The US Palm Storm Cat4 AR-15 is designed as an affordable duty-style rifle, aiming to provide reliable performance and unique features at a price point under $1300.

What is the Monolock system on the US Palm Storm Cat4?

The Monolock system is US Palm's proprietary handguard attachment method. It offers a solid lockup for accessories and interfaces directly with the upper receiver, creating a true free-float barrel for enhanced accuracy.

Does the US Palm Storm Cat4 have an adjustable gas block?

No, the US Palm Storm Cat4 does not feature an adjustable gas block. US Palm designed the gas system to function reliably with both suppressed and unsuppressed configurations without the need for adjustment, prioritizing simplicity.

What are the key internal upgrades on the US Palm Storm Cat4?

Key internal upgrades include a user-serviceable steel cam path insert and a steel pin for the charging handle. These are designed to prevent wear and the common issue of charging handle reciprocation after high round counts.

What caliber is the US Palm Storm Cat4 AR-15?

The US Palm Storm Cat4 AR-15 reviewed is chambered in 5.56 NATO, as is standard for most AR-15 platforms. The company plans to offer other calibers in the future.

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