US PALM STORM CAT4 5.56 NATO Rifle 16" CHF Barrel - Full Ambi Controls - Hiperfire EDT - Mono-Loc Handguard The US PALM STORM CAT4 is a duty-ready rifle built to exceed expectations-delivering premium, $2,000+ rifle performance at an attainable price point. Designed by experts who live and breathe the AR platform, the STORM CAT4 was built for shooters who demand more without overpaying for a name. Every critical wear point has been reinforced with hardened, user-serviceable components to ensure long-term durability and reliability under hard use. Fully ambidextrous controls provide seamless operation in any environment, while an innovative upper-to-handguard interface enhances rigidity-maximizing mechanical accuracy and ensuring repeatability for laser aiming systems. Features 16" cold hammer forged 4150 chrome moly barrel (1:7 twist), HURRICANE hybrid flash hider/compensator with helical twisted-prong design, full ambidextrous controls (safety selector, magazine release, bolt catch/release, charging handle), Mono-Loc handguard system with precision rear-locking interface and 7-sided M-LOK rail, Hiperfire EDT Designated Marksman trigger, US PALM grip engineered for maximum control and comfort, Magpul DT carbine stock, Type III hardcoat anodized 7075-T6 aluminum upper and lower receivers, optic-ready full-length Picatinny rail, 30-round capacity. Weight 7 lbs unloaded, 7.8 lbs loaded. Overall length 33.5" collapsed, 36.8" extended. Built without compromise. Engineered with purpose. When conditions are at their worst, the CAT4 stands ready-because when you step into the storm, your rifle shouldn't have weak points. HURRICANE Hybrid Flash Hider/Compensator The US PALM HURRICANE hybrid muzzle device delivers dual-purpose performance: flash suppression and recoil control. The aggressive helical, twisted-prong design follows the barrel's twist direction to redirect gases, keeping the rifle flatter during fast follow-up shots while breaking up muzzle flash. This hybrid comp/flash hider reduces both flash signature and felt recoil, keeping you on target when it matters most. Full Ambidextrous Controls Full ambidextrous controls are engineered for shooters who demand speed, adaptability, and total command from either side of the rifle. Every critical touchpoint-safety selector, magazine release, bolt catch/release, and charging handle-is fully accessible without forcing the shooter to break grip or shift position. This creates faster, more intuitive operation for support-side transitions, barricade work, or rapid reloads under pressure. Mono-Loc Handguard System Built for absolute confidence, the US PALM Mono-Loc handguard system delivers monolithic-level lockup that pushes rigidity and control beyond the limits of a standard free-float rail. Its precision rear-locking interface keys directly into the upper receiver, creating an ultra-secure foundation that resists flex, maintains accessory alignment, and keeps lasers or optics locked on target under hard use. With continuous top rail, full M-LOK modularity, and rigid 7-sided profile, the Mono-Loc gives shooters maximum space for mission-critical accessories without sacrificing balance or speed. Whether driving through barricades, loading into sling tension, or running high-tempo drills, the system stays rock solid and repeatable-a stability platform engineered for aggressive movement, zero retention, and total front-end control. 16" Cold Hammer Forged Barrel 16" cold hammer forged 4150 chrome moly steel barrel with 1:7 twist provides durability and accuracy. The CHF process work-hardens the barrel steel for extended service life while the 1:7 twist stabilizes a wide range of 5.56 NATO and .223 Remington bullet weights. Hiperfire EDT Designated Marksman Trigger Hiperfire EDT (Enhanced Duty Trigger) Designated Marksman trigger delivers crisp, consistent break for precision shooting. The enhanced trigger design provides reliable performance for duty and competition. US PALM Grip Ergonomics are dialed in with complete in-house designed US PALM grip, engineered with user inputs to maximize control and comfort. The grip geometry enhances weapon retention and handling. Reinforced User-Serviceable Components Every critical wear point has been reinforced with hardened, user-serviceable components to ensure long-term durability and reliability under hard use. The engineered design prioritizes serviceability for sustained performance. Type III Hard Anodized Receivers Type III hardcoat anodized 7075-T6 aluminum upper and lower receivers provide superior wear resistance and corrosion protection. The durable finish ensures reliable function in harsh environments. Optic-Ready Full-Length Rail Optic-ready full-length Picatinny rail accommodates diverse optic mounting options. The continuous rail system provides maximum flexibility for red dots, magnified optics, and backup iron sights. Duty-Ready Performance The STORM CAT4 delivers premium, $2,000+ rifle performance at an attainable price point. Built without compromise and engineered with purpose-when conditions are at their worst, the CAT4 stands ready. The US PALM STORM CAT4 delivers duty-proven performance-Mono-Loc rigidity with full ambi control. SPECIFICATIONS Manufacturer: US PALM Model: STORM CAT4 Caliber: 5.56 NATO Action: Semi-Automatic Barrel Length: 16 inches Barrel Material: 4150 Chrome Moly Steel (Cold Hammer Forged) Barrel Twist: 1:7 Muzzle Device: HURRICANE Hybrid Flash Hider/Compensator (helical twisted-prong) Upper Receiver: Type III Hardcoat Anodized 7075-T6 Aluminum Lower Receiver: Type III Hardcoat Anodized 7075-T6 Aluminum Handguard: US PALM Mono-Loc, 7-Sided M-LOK Rail with Precision Rear-Locking Interface Rail: Continuous Top Picatinny (Full-Length, Optic-Ready) Controls: Full Ambidextrous (Safety, Mag Release, Bolt Catch/Release, Charging Handle) Trigger: Hiperfire EDT (Enhanced Duty Trigger) Designated Marksman Grip: US PALM (In-House Design) Stock: Magpul DT Carbine Stock Magazine Capacity: 30 rounds Overall Length (Collapsed): 33.5 inches Overall Length (Extended): 36.8 inches Overall Height: 7.3 inches Overall Width: 2.7 inches Weight (Unloaded): 7 lbs Weight (Loaded): 7.8 lbs Finish: Black (Type III Hard Anodized)