Overview
The ARRMA 1/10 OUTCAST 4S 4X4 BLX Stunt MT represents the next evolution in fast, capable ready-to-run RC vehicles for UK enthusiasts. This brushless 4WD stunt truck has been completely re-imagined with a centre differential, updated Spektrum electronics, and enhanced dirt protection to deliver next-level handling, performance and speed. Whether you're a seasoned RC basher looking to upgrade or discovering the world of high-performance RC cars for the first time, the OUTCAST 4S BLX offers an affordable middle ground between agile 3S machines and more powerful 6S platforms, making it the ideal choice for serious recreational driving and competitive stunting.
Built on legendary ARRMA engineering principles, this fully assembled, factory-finished stunt truck comes in a striking red colour scheme and arrives ready to blast straight out of the box. With its short 312mm wheelbase and aggressive stance, the OUTCAST 4S is engineered for capability far beyond simple off-road bashing. It excels at eye-popping stunts, nimble obstacle navigation, and responsive high-speed driving across a diverse range of surfaces—from dirt and tarmac to challenging terrain. The comprehensive RTR package includes everything except batteries and charger, meaning you can get driving within hours of purchase.
This isn't just a casual RC vehicle; it's a purpose-built stunt machine packed with professional-grade components, waterproof electronics, and refined suspension geometry that delivers confident control and responsive handling. The OUTCAST 4S BLX stands as one of the most capable ready-to-run RC monster trucks available in the UK market today, combining accessibility with serious performance credentials.
Key Features
- Oil-Filled Centre Differential — The revolutionary aluminium-cased centre differential with 500,000 cSt silicone oil provides incredible traction and handling across all surfaces by maintaining optimal torque distribution through the drivetrain, a feature previously unavailable on entry-level 4S stunt trucks and now standard on this upgraded model.
- Spektrum FIRMA 120A V2 Smart Waterproof ESC — This advanced brushless electronic speed controller features a waterproof and dustproof design rated for intense off-road conditions, delivers 120A continuous current handling for 4S LiPo compatibility, includes an integrated cooling fan for temperature management, and offers user-programmable settings including punch, brake, BEC, reverse speed and motor timing via Spektrum SMART technology.
- Spektrum FIRMA 3668 2400Kv Brushless Motor — A purpose-designed 4-pole brushless motor with beautiful etched aluminium can construction and strong 5mm shaft, rated for 2S, 3S and 4S LiPo operation, featuring gold 4mm bullet connectors and integrated heatsink with cooling fan to manage thermal stress during extreme bashing and stunting sessions.
- Spektrum S662 Metal-Geared Digital Servo — Higher torque rated at 17kg/236 oz-in with lightning-fast 0.15 second response at 60 degrees, this servo features an alloy case centre for superior heat dissipation and improved durability, steel gears with 25T output spline, and operates on 7.4V for more power than standard analogue alternatives.
- Enhanced Dirt Protection System — Multiple layers of defence keep your investment running smoothly: wishbone dirt guards protect rear driveshafts, taller side guards provide additional perimeter protection, and a comprehensive dirt drain system in the updated chassis prevents debris accumulation during intense driving sessions.
- Tough Composite Chassis with Centre Diff Module — The revised composite chassis accepts the centre differential module and features enhanced hingepin bracing for structural rigidity, integrated dirt drain channels, and grommeted windows for easy access to motor screws, maintaining ARRMA's famous modularity for quick maintenance and tuning adjustments.
- Dual Protocol Spektrum SLT3 2.4GHz Radio System — Factory-installed SLT protocol transmitter with improved grip and trigger feel, paired with SR315 3-channel dual protocol receiver compatible with both SLT and DSMR transmitters, offering fast response times, outstanding range, and learner-friendly 50% and 75% throttle modes for developing driving skills.
- Short Wheelbase Stunt Geometry — The 313mm wheelbase allows the OUTCAST 4S to flip and manoeuvre with ease, making it ideally suited for stunt driving, obstacle negotiation, and dynamic terrain changes, whilst the 515mm overall length and wide 450mm front and rear track provide exceptional stability and control during high-speed runs.
- EXtreme Bash All-Metal Gear Differentials — Front and rear differentials feature proven steel main and input gears for durability, complemented by the new high-viscosity centre differential (500,000 cSt), delivering unstoppable power delivery and superior traction control.
- EXtreme Bash CVD Slider Driveshafts — Tough composite sliders with steel CV couplings provide impact-absorbing constant velocity joints that deliver reliable power whilst protecting the drivetrain during aggressive bashing, jumps and stunting manoeuvres.
- Long Travel Oil-Filled Suspension — Aluminium shock bodies with long travel geometry, soft silicone o-rings for supreme sealing, and standard 550 cSt shock oil (front and rear) deliver plush, responsive suspension action that absorbs impacts whilst maintaining directional control and tyre contact.
- High Shock Towers — Extended shock tower design allows longer suspension travel, increasing ground clearance and articulation whilst distributing impacts more effectively across the chassis structure.
- Wide Double Wishbone Arms — Tough composite suspension arms with wide geometry provide exceptional stability during cornering and jumping whilst distributing suspension forces efficiently throughout the chassis.
- 17mm Aluminium Wheel Hexes — CNC-machined anodised red aluminium wheel hubs provide increased durability, impressive aesthetics, and reliable fitment for the included 17mm tyres.
- dBoots BACK-FLIP LP Vented Tyres — Aggressive tread pattern multi-terrain tyres with vented construction for improved durability and consistent grip across diverse surfaces including dirt, concrete and mixed terrain, mounted on medium-insert wheels for balanced performance.
- Waterproof and Dustproof Electronics — The Spektrum FIRMA 120A V2 ESC and S662 servo feature waterproof design standards appropriate for intense off-road use, allowing confident driving through wet conditions and dusty environments without concern for component failure.
- Modular Design with Easy Maintenance — The larger power module accommodates the centre differential whilst remaining completely removable, grommeted motor access windows enable quick servo access, and the comprehensive design makes routine maintenance and tuning fast and straightforward for drivers of all experience levels.
- Integrated Servo Saver — Protects the servo from damage during hard landings and crashes through mechanical shock absorption, now featuring 25T spline fitment compatible with the upgraded S662 servo.
- Tough Composite Wing with Double-Headed Steel Skids — Factory-installed injection-moulded rear wing with replaceable steel skids provides both aesthetic appeal and protective function, contributing to controllable weight distribution during wheelies and inverted flying.
- Integrated Wheelie Bar — Equipped with rubber tyres for smooth ground contact, enabling effortless stunt action and controlled weight transfer during acceleration and braking manoeuvres.
- Aluminium Motor Plate — Precision-machined motor mounting ensures accurate gear mesh maintenance even in the harshest driving conditions, critical for reliability and performance consistency.
- Front and Rear Skid Plates — Composite protection elements guard the chassis where impacts matter most, reducing damage from collisions and rough terrain whilst maintaining clean lines and aerodynamic function.
- Integrated Wheelie Bar with Rubber Tyres — Enables controlled stunt driving and weight distribution management, contributing to the vehicle's renowned stunt capability and fun factor.
- Captured Hingepins with Turnbuckle Links — Suspension geometry remains secure even during extreme impacts, with turnbuckle adjustments allowing fine-tuning of ride height and suspension response characteristics.
- Improved Battery Retention System — Wire clips provide enhanced battery security during aggressive driving, preventing battery movement or disconnection during high-impact manoeuvres.
- Two Fresh Colour Options — Available in striking red (this model) and gunmetal grey, allowing drivers to choose their preferred aesthetic whilst maintaining identical performance specifications.
Technical Performance
The ARRMA OUTCAST 4S BLX represents a significant leap forward in ready-to-run brushless RC technology. At its core sits the Spektrum FIRMA 3668 2400Kv brushless motor, a 4-pole design rated specifically for 4S LiPo power (also compatible with 2S and 3S configurations), delivering smooth and consistent power delivery through an etched aluminium can and gold 4mm bullet connectors. The motor is paired with the Spektrum FIRMA 120A V2 Smart ESC, an intelligent waterproof and dustproof electronic speed controller capable of handling the full 120A current draw whilst maintaining thermal stability through an integrated cooling fan. This ESC features IC5 connectors (EC5 compatible) and Spektrum SMART technology compatibility, allowing programmable customisation of punch intensity, braking response, BEC output, reverse speed and motor timing parameters to suit individual driving preferences.
The transmission system delivers a fixed 12.48:1 final drive ratio through 57-tooth steel spur gear and 13-tooth steel pinion arrangement, paired with a 2.85:1 internal gear ratio within the differential system. The centre differential, a significant engineering achievement for this class, uses 500,000 cSt silicone oil internally whilst the front and rear differentials run at 10,000 cSt. Steel main and input gears throughout ensure durability under sustained bashing conditions. Driveshaft delivery occurs through EXtreme Bash CVD slider designs with steel CV couplings, capable of handling the power delivery without slip or wear. The suspension geometry combines 313mm wheelbase (short enough for stunting) with a 515mm overall length, 450mm front and rear track width, and 63mm ride height that together create an aggressive stance with confident handling. Oil-filled aluminium shock bodies contain 550 cSt silicone oil front and rear, with silicone o-rings providing supreme sealing against dirt ingress.
The servo system features the Spektrum S662 metal-geared digital servo with 17kg/236 oz-in torque output and lightning-fast 0.15-second response time at 60 degrees, operating on 7.4V nominal. The servo features an alloy case centre for heat dissipation and steel gearing for durability. The radio system employs a Spektrum SLT3 2.4GHz transmitter with improved ergonomic grip and trigger feel, paired with the SR315 3-channel dual protocol receiver capable of accepting both SLT and DSMR protocol transmitters, ensuring future compatibility and offering real-time telemetry capability in DSMR mode. The complete package weighs 4.17kg (9lbs 3oz) excluding battery and arrives fully assembled with trimmed and finished injection-moulded composite body in striking red.
For power, the OUTCAST 4S BLX accepts LiPo batteries within 165 x 51 x 48mm dimensions, with recommended specifications of 5000mAh capacity and 35C minimum continuous discharge rating. The vehicle runs equally well on single 3S, dual 2S, or single 4S hardcase LiPo batteries, with the IC5 loop connector supplied allowing flexible battery configuration. The comprehensive RTR package includes multi-tool, 2.0mm and 2.5mm hex wrenches, four AA batteries for the transmitter, and complete instruction manual covering assembly, maintenance and operation. Two-year limited warranty covers manufacturing defects, providing confidence in ARRMA's product quality and support infrastructure.
What's in the Box
- 1x ARRMA OUTCAST 4S 4X4 BLX Stunt Truck RTR (fully assembled and finished)
- 1x Spektrum FIRMA 120A V2 Smart Waterproof ESC
- 1x Spektrum FIRMA 3668 2400Kv Brushless Motor with heatsink and cooling fan
- 1x Spektrum S662 Metal-Geared Digital Servo (17kg/236 oz-in torque)
- 1x Spektrum SLT3 2.4GHz 3-Channel Transmitter
- 1x Spektrum SR315 3-Channel Dual Protocol Receiver
- 4x AA Alkaline Batteries (for transmitter)
- 1x Multi-Tool with Hex Wrenches (2.0mm and 2.5mm)
- 1x IC5 Loop Connector (for flexible battery configuration)
- 1x Instruction Manual and documentation
What You Need to Complete
- 1x 3S LiPo (11.1V), 2x 2S LiPo (paired), or 1x 4S LiPo (14.8V) Hardcase Battery — minimum 5000mAh capacity, 35C continuous discharge rating, within dimensions 165 x 51 x 48mm
- 1x Compatible LiPo Battery Charger (AC mains or DC)
- 1x LiPo Safe Charging Bag (essential safety equipment)
Frequently Asked Questions
- Is the ARRMA OUTCAST 4S BLX suitable for beginners? — Yes, the OUTCAST 4S BLX is classified as Skill Level 3 (intermediate), making it suitable for drivers with some RC experience. The included Spektrum SLT3 transmitter offers learner-friendly 50% and 75% throttle modes allowing beginners to develop driving skills progressively, whilst advanced drivers can unlock full performance. The robust construction and waterproof electronics mean it forgives mistakes, and the modular design makes repairs straightforward. If you're new to RC, consider starting with basic driving lessons before attempting advanced stunting.
- What battery does the OUTCAST 4S BLX require? — The vehicle accepts flexible battery configurations: a single 4S LiPo (14.8V, 5000mAh minimum), a single 3S LiPo (11.1V, 5000mAh minimum), or two 2S LiPo packs paired together (11.1V combined). All batteries must be hardcase format within 165 x 51 x 48mm maximum dimensions with 35C minimum continuous discharge rating. The supplied IC5 loop connector enables simple switching between battery configurations without modification.
- What is the difference between the centre diff version and standard OUTCAST 4S models? — This V2 model features a revolutionary oil-filled aluminium centre differential (500,000 cSt silicone oil) that provides ultimate traction and superior handling across all surfaces, a feature not present on earlier OUTCAST 4S generations. Additionally, the V2 benefits from an updated chassis with centre diff module, enhanced hingepin bracing, integrated dirt drain, updated Spektrum FIRMA 120A V2 Smart ESC with improved driving feel, higher torque Spektrum S662 servo with alloy case centre, additional dirt protection through wishbone guards and side guards, and improved battery retention with wire clips. These cumulative improvements represent a complete evolution of the platform.
- How fast does the OUTCAST 4S BLX go? — Whilst exact top speed varies with battery configuration and terrain, the 2400Kv brushless motor on 4S LiPo delivers impressive pace suitable for aggressive outdoor bashing. The 1/10 scale and 4S brushless power train position it as a serious speed-capable vehicle, though the short wheelbase and stunt-focused geometry mean top speed is secondary to handling and stunt capability. Real-world speeds depend on weight, terrain grip, battery discharge state and driving technique.
- Is this RC truck waterproof? — The Spektrum FIRMA 120A V2 ESC and S662 servo both feature waterproof and dustproof design standards appropriate for intense off-road conditions, allowing confident driving through wet terrain. However, the electronics are not completely submersible—avoid submerging the vehicle or exposing electronics to sustained water pressure. Light rain, water splashes and wet ground are perfectly fine.
- What makes the centre differential important? — The centre differential distributes power between the front and rear axles, allowing them to operate independently during cornering whilst maintaining traction during straight-line acceleration. The oil-filled design (500,000 cSt) provides exceptional grip and control across diverse surfaces, significantly improving steering response, cornering speed, and overall handling feel compared to solid centre diff designs. This is a professional-level feature now accessible in ready-to-run vehicles.
- Can I upgrade components on the OUTCAST 4S BLX? — Yes, ARRMA designed the OUTCAST with modularity in mind. The larger power module accommodates centre differential whilst remaining completely removable for tuning, suspension components are upgradeable, and the servo saver is now 25T spline fitted with the upgraded S662 servo. The extensive aftermarket parts availability from ARRMA and third parties (including chassis braces and tuning parts) ensures you can customise and develop your truck for competitive or recreational driving.
- How long does the battery last per charge? — Runtime depends heavily on driving style, terrain, battery capacity and condition. A fresh 5000mAh 35C LiPo typically provides 20-30 minutes of mixed driving, though aggressive high-throttle stunting reduces runtime whilst steady bashing extends it. We recommend purchasing multiple batteries to maximise track time, as recharging from depleted state takes 45-60 minutes depending on charger specifications.
- What is included in the 2-year warranty? — ARRMA provides a 2-year limited warranty covering manufacturing defects in materials and workmanship. The warranty excludes damage from crashes, impacts, water submersion, modifications, and normal wear items like tyres and suspension components. Consult the instruction manual for complete warranty terms and any geographic restrictions.
- Is the OUTCAST 4S BLX RTR ready to drive immediately? — Nearly—you just need to charge a compatible LiPo battery, insert four AA batteries into the transmitter, and bind the receiver to the transmitter (simple one-time procedure detailed in the instruction manual). Within two hours of purchasing, you can be driving. No mechanical assembly, wiring or soldering required.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the ARRMA 1/10 OUTCAST 4S 4X4 BLX Stunt MT (with Centre Diff) Red C-ARA4410V2T4 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
