Century Arms US Palm STORM CAT4 Pistol 5.56 NATO 11.5in 30+1

About this product

The US Palm STORM CAT4 Pistol is an AR-style semi-automatic platform built for compact handling and modularity. Designed with a short 11.50″ barrel and a full-length Picatinny rail, it is optimized for optic mounting and accessory integration. The pistol features ambidextrous controls and an adjustable polymer brace for adaptable ergonomics and fast operation. Key components include an M-LOK seven-sided handguard and a Hiperfire EDT designated marksman trigger for consistent breaks.

Key Specifications

• Chambered in .223 Rem / 5.56 NATO.
• Operates as a Semi-Auto action.
• The barrel measures 11.50 inches and is described as threaded.
• Magazine capacity is 30 + 1 rounds.
• Barrel construction is listed as cold hammer forged in product copy.
• The muzzle is fitted with a US Palm Hurricane Flash Hider and the thread pattern is 1/2″-28.
• Equipped with a Hiperfire EDT designated marksman trigger.
• The handguard uses a M-LOK interface on a mono-loc seven-sided rail.
• Features an adjustable polymer pistol brace / stock description with a matte black finish.
• Unloaded weight is listed as 6 lbs.

The STORM CAT4 blends a compact profile with a rigid front-end platform for repeatable accessory alignment and reliable handling. Its combination of a short cold hammer-forged barrel, ambidextrous controls, and a crisp trigger makes it a practical choice for shooters seeking a maneuverable AR-pattern pistol for range use, duty-style applications, or personal defense in constrained environments.