{"product_id":"ferox-kit-receiver","title":"Ferox kit receiver -PRE ORDER-","description":"\u003ch2\u003e(you will be contacted via email)\u003c\/h2\u003e\n\u003ch2\u003eThe Evolution of HPA Performance\u003c\/h2\u003e\n\u003cp\u003eThe\u003cstrong\u003e FEROX\u003c\/strong\u003e is a premium CNC-machined aluminum upper receiver engineered specifically for HPA builds where reliability, consistency, and ease of maintenance are essential.\u003c\/p\u003e\n\u003cp\u003eDesigned and manufactured from high-grade aluminum with precision CNC machining, FEROX is available in multiple anodized finishes and is compatible with most \u003cstrong\u003eM4 platform lowers\u003c\/strong\u003e on the market.\u003c\/p\u003e\n\u003cp\u003eUnlike traditional upper receivers, FEROX has been designed around the HPA system, creating a rigid structure that guarantees perfect alignment between the \u003cstrong\u003eHPA engine\u003c\/strong\u003e, \u003cstrong\u003ehop-up chamber\u003c\/strong\u003e, and \u003cstrong\u003einner barrel\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003ePerfect Alignment. Every Time.\u003c\/h2\u003e\n\u003cp\u003eOne of the biggest challenges of HPA builds is maintaining the correct alignment between the engine and the hop-up.\u003c\/p\u003e\n\u003cp\u003eFEROX solves this problem with a dedicated mechanical positioning system.\u003c\/p\u003e\n\u003cp\u003eOnce the initial setup has been completed, every component always returns to its exact position after maintenance, eliminating the need for repeated adjustments and ensuring consistent feeding and air seal.\u003c\/p\u003e\n\u003cp\u003eNo more trial-and-error.\u003cbr\u003eNo more constant tuning.\u003cbr\u003eSimply consistent performance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFast Maintenance\u003c\/h2\u003e\n\u003cp\u003eMaintenance has never been easier.\u003c\/p\u003e\n\u003cp\u003eOnly \u003cstrong\u003e3 screws\u003c\/strong\u003e are required to access the HPA engine directly.\u003c\/p\u003e\n\u003cp\u003eThe complete front assembly can be removed by loosening just \u003cstrong\u003e2 additional screws\u003c\/strong\u003e, allowing quick access to the hop-up chamber and inner barrel.\u003c\/p\u003e\n\u003cp\u003eThis dramatically reduces maintenance time during both practice and competition.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eQuick Release Hop-Up System\u003c\/h2\u003e\n\u003cp\u003eFEROX includes an innovative quick-release hop-up system designed to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003ePrecisely position the hop-up with your preferred magazines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaintain repeatable alignment after every disassembly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAllow fast removal for cleaning or maintenance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEliminate unwanted movement during use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe result is greater consistency, improved reliability, and easier servicing.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCNC Construction\u003c\/h2\u003e\n\u003cp\u003eEvery FEROX upper is precision CNC machined from aluminum and finished with high-quality anodizing.\u003c\/p\u003e\n\u003cp\u003eCompared to the SKP Carbon Fiber Upper, the aluminum version weighs approximately \u003cstrong\u003e50 grams more\u003c\/strong\u003e, providing increased rigidity and durability while maintaining excellent handling.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ch3\u003eCompatible HPA Engines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003ePolarStar F2\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePolarStar JACK\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWolverine Inferno\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Hop-Up Chambers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eMaxx Model \u003cem\u003e(recommended)\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNexx Speed \u003cem\u003e(recommended)\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePolarStar\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRetro Arms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eand most M4-compatible hop-up units\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Lowers\u003c\/h3\u003e\n\u003cp\u003eCompatible with most M4 platform lowers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest performance is achieved with:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eSKP Lower\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSKP Gearbox\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePolarStar F2 Engine\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMaxx Model Hop-Up\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNexx Speed Hop-Up\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003ePackage Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eFEROX Front\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFEROX Back\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEngine mounting plate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRear endcap bushing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFront bushing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCNC Front Sight\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAluminum Magic Pin\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQuick-release hop-up mounting system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eComplete mounting screws\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eImportant Compatibility Notice\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFEROX requires the lower half of an HPA gearbox\u003c\/strong\u003e, such as the \u003cstrong\u003eSKP Gearbox\u003c\/strong\u003e, to function correctly.\u003c\/p\u003e\n\u003cp\u003ePlease ensure your build includes a compatible lower gearbox shell before purchasing.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCNC-machined aluminum construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMultiple anodized color options\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePerfect engine-to-hop-up alignment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFixed positioning system for repeatable assembly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDirect engine access with only 3 screws\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFront assembly removable with only 2 screws\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQuick-release hop-up system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with most M4 lowers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned specifically for competitive HPA builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBuilt for reliability, precision, and fast maintenance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFEROX isn't just another upper receiver—it's a complete HPA platform engineered to maximize consistency, simplify maintenance, and deliver uncompromising performance on the field.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Skull Performance","offers":[{"title":"Aluminium standard endcap \/ Supplied with gen.4 grip \/ SKP lower 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