Gas replica Hi-Capa 5.1 Vanguard Optics Ready ARCTURUS

The Hi-Capa 5.1 Vanguard Optics Ready ARCTURUS gas replica, a competition base designed for customization

The Hi-Capa 5.1 Vanguard Optics Ready ARCTURUS gas replica is a semi-automatic GBB handgun designed for airsoft players looking for a reliable, accurate base that is directly compatible with the Tokyo Marui Hi-Capa ecosystem. With a CNC-machined aluminum body and slide, treated steel internal parts and a 6.03 mm precision barrel, this handgun is suited to both field players and competitors.

Construction and materials: machined aluminum, treated steel, technical polymer

The body and slide are fully CNC-machined from aluminum, ensuring precise geometry and consistent solidity across the entire structure. The functional internal parts, including the slide catch, hammer, trigger, chien, mag release, cut-off lever, valve striker and its lock, are manufactured from MIM steel and subjected to a dual QPQ heat treatment process. This process significantly improves resistance to wear and corrosion, extending the lifespan of the components most stressed during the firing cycle.
The grip is molded from nylon fiber-reinforced polymer, textured for a firm hold even in wet conditions. The magazine parts are made from SEFP (Super Enhanced Formulated Polymer), a technical material chosen for its robustness under repeated mechanical stress.

Outer barrel and ENT-treated precision barrel

The precision barrel is made from carbon steel with an inner diameter of 6.03 mm and a length of 113 mm. It features the ENT (Enduraheat Nitride Treatment) process, a thermochemical treatment that hardens the metal surface to limit wear. Combined with the adjustable hop-up, this barrel allows precise backspin adjustment depending on the weight of BBs used.
The outer barrel is in metal and threaded 11 mm clockwise (CW), making it directly compatible with 11 mm CW standard suppressor or tracer adapters available on the market.

Optics Ready and field versatility

The slide features a factory-cut RMR footprint, allowing direct mounting of an RMR-type red dot sight without any machining or additional adaptation. An RMR plate with a 19 mm pitch is included with the replica. For users who prefer traditional sighting systems, a rear sight is present on the plate and the front sight integrates a green fiber optic for fast target acquisition in low-light conditions.
The 5-slot Picatinny rail positioned under the barrel can accommodate a tactical flashlight or laser pointer. The controls, including the safety, slide catch and mag release, are all ambidextrous, making the replica accessible to both right- and left-handed users without modification.

Compatibility and cold weather use

The Hi-Capa 5.1 Vanguard Optics Ready ARCTURUS is compatible with Tokyo Marui Hi-Capa parts. This makes it an ideal base for custom builds, with immediate access to the full Hi-Capa parts and accessories ecosystem available on the market. The included magazine is also Marui-compatible.
The gas system is optimized to operate below 10°C, which is a tangible advantage for games in colder conditions, where standard gas replicas lose efficiency. The blowback delivers a pronounced recoil thanks to the integrated pre-shot technology, which enhances the shooting feel and cycle management.

• What optics can I mount on the ARCTURUS Hi-Capa 5.1 Vanguard Optics Ready gas replica?

  The slide is specifically machined to directly accept RMR-format red dot sights. A dedicated RMR mount with a 19 mm hole spacing is included in the box to allow direct installation of your optic.

• Is the ARCTURUS Hi-Capa 5.1 Vanguard Optics Ready gas replica compatible with standard Hi-Capa accessories?

  Yes, this replica offers full compatibility with Hi-Capa (Tokyo Marui) standards. This includes magazines as well as internal and external parts, making customization or maintenance of your model significantly easier.

• What types of accessories can be attached to the replica's barrel?

  The metal outer barrel features an 11 mm CW (clockwise) thread. You can directly screw on a 14 mm CCW adapter to install a compatible suppressor or tracer unit.

• How does the ARCTURUS Hi-Capa 5.1 Vanguard Optics Ready gas replica perform in cold weather?

  The gas system has been optimized to maintain reliable operation even in low-temperature conditions, below 10°C. Its design includes MIM steel internal parts treated with QPQ carbonitriding, ensuring excellent mechanical durability under stress.

• What is the role of SEFP polymer in the included magazines?

  SEFP (Super Enhanced Formulated Polymer) is used for magazine components to significantly increase their resistance to wear and impact. This material provides superior longevity compared to standard polymers during intensive gameplay or competition use.

• What is included in the box at purchase?

  The box contains the ARCTURUS Hi-Capa 5.1 Vanguard Optics Ready gas replica, a gas magazine with a capacity of 31 BBs, a 19 mm hole spacing RMR mount, a cleaning rod, two Allen keys, a set of replacement O-rings, an additional recoil spring, a hop-up tensioner, and the user manual.

• What is the benefit of the integrated precision barrel?

  The 6.03 mm carbon steel inner barrel benefits from an ENT (Enduraheat Nitride Treatment) process. This treatment improves the hardness of the barrel's inner surface for better consistency and increased long-term corrosion resistance.

1 x Hi-Capa 5.1 Vanguard Optics Ready ARCTURUS gas replica
1 x 31 BBs gas magazine
1 x 19 mm RMR mounting plate
1 x Cleaning rod
2 x Allen key
1 x O-ring set
1 x Recoil Spring
1 x Hop-up tensioner
1 x User manual

• Pistol replicas
• Caliber 6 mm
• Propulsion Gas
• Shooting mode Semi-automatic
• Energy 0.95 Joules
• Speed 320 FPS
• Model Hi-Capa 5.1 Vanguard Optics Ready
• Length 220 mm
• Internal barrel length 113 mm
• Internal barrel diameter 6,03 mm
• No screws 11 mm CW
• Weight 945 g
• How it works Adjustable Hop-Up
• Design Aluminum / Steel / Polymer
• Blowback system Yes
• Integrated tactical rail Picatinny
• Charger 31 BBs
• Colors Black
• Brand Arcturus