US PALM Storm CAT4 – 5.56 NATO, 16" Barrel, Black (RI0001000-1-AA-N)
US PALM's first ground-up AR, the Storm CAT4 in black: 5.56x45mm NATO, a 16-inch cold-hammer-forged 4150 chrome-moly barrel, 1:7 twist, full ambidextrous controls, a Hiperfire EDT Designated Marksman trigger, and the Mono-Loc free-float handguard. Unloaded weight is 7 pounds. US PALM part RI0001000-1-AA-N, UPC 787450951532.
This listing is for the black 5.56 NATO Storm CAT4 rifle only.
Mono-Loc Handguard
The Mono-Loc is US PALM's upper-to-handguard lockup. A rear-locking interface keys the rail into the upper, which US PALM rates as a true free-float, seven-sided M-LOK handguard with a continuous top rail. The point is rigidity: less rail flex, and lasers or optics that stay put under hard use.
Hurricane Muzzle Device
The Hurricane is a hybrid flash hider and compensator. US PALM gives it a helical, twisted-prong layout that follows the barrel's twist, meant to cut flash and keep the rifle flatter on follow-up shots.
Ambidextrous Controls
Every primary control is ambi: 45-degree safety, magazine release, bolt catch/release, and charging handle. The lower has a flared magwell. The grip is US PALM's reduced-angle design; the stock is a Magpul DT carbine.
Barrel, Receivers, and Trigger
- 16-inch cold-hammer-forged 4150 chrome-moly barrel, 1:7 twist.
- Upper and lower: 7075-T6 aluminum, Type III hardcoat anodized.
- Critical wear points use hardened, user-serviceable components.
- Hiperfire EDT Designated Marksman trigger.
- Optic-ready full-length Picatinny rail. Magazine capacity 30 rounds.
US PALM Storm CAT4 Specifications
| Manufacturer | US PALM / Century Arms |
| Model | Storm CAT4, Black |
| Part Number | RI0001000-1-AA-N |
| UPC | 787450951532 |
| Caliber | 5.56x45mm NATO |
| Barrel Length | 16" |
| Barrel | Cold hammer forged 4150 chrome-moly steel |
| Twist Rate | 1:7 |
| Muzzle Device | US PALM Hurricane hybrid flash hider/compensator |
| Handguard | US PALM Mono-Loc, 7-sided M-LOK, true free-float, continuous top rail |
| Upper / Lower | 7075-T6 aluminum, Type III hardcoat anodized |
| Trigger | Hiperfire EDT Designated Marksman |
| Stock | Magpul DT Carbine |
| Grip | US PALM reduced-angle grip |
| Controls | Fully ambidextrous (45-degree safety, mag release, bolt catch/release, charging handle) |
| Magwell | Flared |
| Sights | Optic-ready full-length Picatinny rail |
| Magazine Capacity | 30 rounds |
| Overall Length, collapsed | 33.5" |
| Overall Length, extended | 36.8" |
| Overall Height | 7.3" |
| Overall Width | 2.7" |
| Weight, unloaded | 7 lbs |
| Weight, loaded | 7.8 lbs |
| Finish Color | Black |
| Origin | Made in USA |
Frequently Asked Questions
What caliber is this?
US PALM chambers the Storm CAT4 rifle in 5.56x45mm NATO. This listing is that black rifle only.
Is it fully ambidextrous?
Yes. US PALM lists a 45-degree safety, magazine release, bolt catch/release, and charging handle, all ambi.
Does it come with a magazine?
US PALM publishes a 30-round capacity. How many magazines ship in the box is not listed. Contact us to confirm what is in current production packaging.
Are iron sights included?
US PALM lists an optic-ready full-length Picatinny rail. Iron sights are not specified. Contact us to confirm the unit in stock.
What trigger is in it?
A Hiperfire EDT Designated Marksman trigger.
All firearm purchases must ship to a licensed FFL dealer. Manufacturer specifications are subject to change without notice.
Internal Reference:
RI0001000-1-AA-N
Barcode:
787450951532
| Brand: US Palm |
| Model: AR-15 |
| Caliber: 5.56mm |
| Capacity: 30 |
| Barrel Length: 16" |
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This item cannot be shipped to the following locations due to legal or carrier restrictions:
Restriction Details
This product cannot be sold or shipped to your location due to magazine capacity restrictions. Magazine capacity cannot exceed 10rd. If you believe this to be incorrect or if you're exempt from the restriction, please contact us at 636-791-1655.
Affected States/Territories (10):
Restriction Details
Colorado prohibits magazines with a capacity exceeding 15rd. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.
Affected States/Territories (1):
Restriction Details
Vermont restricts rifle magazine capacity to 10rd. This exceeds the state's restricted capacity. If you believe this is in error or if you are exempt from the restriction, please contact us at 636-791-1655.