Outer Barrels
Suppressors
Magazines
Inner Barrels
Hop Up Chambers
Buckings
Gearbox Shells
Drop-In Gearboxes
Mosfets
TRIGGERS
AEG Internals
HPA Parts
Umbrella Armory ARC M4 | Arcturus MLOK Custom AEG
Umbrella Armory ARC M4 | Arcturus MLOK Custom AEG
Professionally tuned performance. Ready to play out of the box.
- Umbrella Armory high-end barrel system
- Precision hop-up tuning
- Fully inspected internals
High-end barrel system
Premium 6.01mm precision inner barrel with Maple Leaf bucking and CNC hop-up unit for superior accuracy and consistency.
Precision hop-up setup
Professionally tuned hop-up system ensures optimal BB trajectory and maximum effective range for every shot.
Professional inspection & tuning
Every rifle undergoes thorough inspection and fine-tuning by our expert technicians to ensure peak performance out of the box.
Umbrella Armory Barrel System.
Our precision-engineered barrel system features a high-end 6.01mm inner barrel that delivers exceptional accuracy and consistency. Every barrel is carefully matched with precision air seals to ensure optimal compression, while our optimized alignment process guarantees perfect barrel-to-hop-up integration for maximum performance.
Precision Hop-Up Setup.
Each rifle receives a premium bucking carefully selected and installed for optimal BB contact and spin. Our tuned hop-up unit is precisely adjusted to provide consistent backspin across all BB weights, ensuring maximum effective range and accuracy with every shot.
Internal Inspection & QC.
Before leaving our workshop, every gearbox undergoes comprehensive inspection to verify all components are properly installed and functioning. Compression is tested and verified to ensure optimal air seal, and each rifle is performance tuned to deliver consistent velocity and reliability.
Umbrella Armory Markings.
Every upgraded rifle features our distinctive Umbrella Armory logo, a unique serial number for tracking and warranty purposes, and professional branding that identifies your rifle as a premium Umbrella Armory build. These markings are precision laser-engraved for durability and authenticity.
Comparison Table
You're not paying for parts. You're paying for performance that actually works.
| Feature | Stock Arcturus | Umbrella Armory ARC M4 |
|---|---|---|
| Inner barrel | Standard | High-end system |
| Hop-up tuning | Factory | Umbrella Armory tuned |
| QC | Factory | Professional |
| Ready to play | ⚠️ | ✅ |
| Time spent | Hours | None |
What's in the Box
Umbrella Armory ARC M4 rifle
Magazine
Umbrella Armory QC card
Documentation
Gun Box with Foam Filling and Carrying Handle
Product Information
Legal and safety
Long product info
Short description
Technical Overview
Barrel inner diameter mm
Barrel length mm
Battery connector
Battery required voltage
Brand
Compatibility
- v2 fully upgradable
Effective range m
Hopup type
Magazine type
Manufacturer
Material frame
Mosfet
Platform type
Warranty period
Build List
Barrel type
Buffer tube
Engine
Flash hider
Gearbox version
Gun bag
Handguard
Mag catch
Outer barrel
Pistol grip
Receiver
Selector switch
Sling plate
Stock
Trigger
Tuning and Settings
All rifles hand built and fine tuned. Settings may vary. Use this as a baseline
Engine Overview
Performance Limits
About Umbrella Armory
Umbrella Armory is a performance engineering workshop specializing in precision-tuned airsoft rifles and HPA systems. Founded in California and now operating in Austria, Umbrella Armory builds fully optimized replicas for competitive players who demand real ballistic consistency and reliability.
Every rifle is individually assembled, calibrated, and verified under live conditions to deliver perfect shot-to-shot accuracy and efficiency.
Umbrella Armory’s mission is to bring professional-grade performance to serious players worldwide — combining craftsmanship, testing, and innovation for the most consistent airsoft systems in the field.