US Palm Storm Cat4
US Palm · Rifle · In Production · 2026
Also known as: Storm CAT4
Overview
The US Palm Storm Cat4 is a semi-automatic, direct-impingement AR-15 rifle chambered in 5.56 NATO, introduced at SHOT Show 2026 as US Palm's entry into the standalone AR rifle market. The 16-inch variant is built on billet 7075-T6 aluminum upper and lower receivers with a cold hammer-forged 4150 chromoly barrel (1:7 twist) wearing a nitride finish, a mid-length gas system, a Mono-Loc free-float M-LOK handguard, a Hiperfire EDT Designated Marksman trigger, fully ambidextrous controls, an adjustable polymer stock, and the US Palm Hurricane hybrid flash hider/brake.
Specifications
| Weight (empty) | 3175 g (112.0 oz) |
| Barrel Length | 406 mm (15.98") |
| Action Type | Gas Operated Long Stroke |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Magazine Capacity | 30 rounds |
| Magazine Type | Detachable Box |
| Effective Range | 500 m (547 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 178 mm (7.01") |
| Frame Material | Aluminum |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Nitride |
Calibers
- 5.56x45mm NATO · primary · 5.56mm NATO — also known as 5.56 NATO, 5.56x45mm, .223 Remington (chamber compatible)
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Thumb Safety
- Features: Billet Receivers, Cold Hammer Forged Barrel, Mid Length Gas System, Free Float M Lok Handguard, Hiperfire Edt Trigger, Hurricane Hybrid Muzzle Device, Ambidextrous Controls, Reduced Angle Grip, Adjustable Stock
Variants
- US Palm Storm Cat4 11.5" Pistol — Pistol 11 5in
Production
Production years: 2026-present
Distributed through Palmetto State Armory; launched at SHOT Show 2026
Origin
Country of origin: United States
Notes
Offered as a 16-inch rifle and an 11.5-inch AR pistol, in Black and Storm Green. The Hurricane muzzle device uses a helical twisted-prong design to reduce muzzle rise. MSRP approximately $1,399.
Background
US Palm built its reputation on AK furniture and soft body armor before pivoting into complete AR-15 rifles; the Storm Cat4's seven-sided M-Lok fore-end and 'Hurricane' muzzle device lean hard into the brand's storm-themed naming.