When an electric classic decides to breathe at another pressure 
020 poetry 

Introduction: HPA, the next logical step 

In airsoft, evolution has always been linked to consistency: more stability, more responsiveness and more control over every shot. HPA (High Pressure Air) has been the territory of demanding players and speedsoft fans for years. A system that replaces traditional electric mechanics with pressurised air, offering a clean, regular and almost instantaneous cycle. Less vibration, less wear, more precision. And now, ROSSI decides it’s time to democratise it together with MechLabs.

Neptune & Sentinel: two ranges, one same DNA

Over the last few years, ROSSI has consolidated two clearly defined product lines: 

Neptune: the premium range
A replica designed for players who want top-tier performance from day one. Enhanced barrels, electronic triggers, advanced mosfets, and internals that don’t force the user to “open anything.” The Neptune was born to compete in higher leagues, and it has proven itself.

Sentinel: accessible efficiency

ROSSI’s affordable line stood out precisely for this: low price, solid performance and real field reliability. A product made for those who want performance without breaking the bank. Good body, correct internals and a plug-and-play concept perfect for starting with confidence.

And now both series receive a new heart: the MechLabs XX-Mod HPA Kit.
  
The joint leap: ROSSI introduces its Neptune and Sentinel HPA

ROSSI doesn’t just adapt a motor. It changes the entire concept. Both the Neptune HPA and the Sentinel HPA will integrate the HPA KIT M4 MechLabs XX-Mod HPA Engine for GB CNC, turning them into hybrid platforms: the ergonomics and style we already know, but with the regularity and response of a pure mechanical HPA system. 

MechLabs XX-Mod HPA Engine : le cœur noir qui change la partie

The prestigious manufacturer MechLabs presents one of the most interesting HPA units on the market: the XX-Mod HPA Engine for GB, made of CNC-machined aluminium, fully mechanical and with no internal electronics. No mosfets, no wires, no sensors: just pure engineering.

What does “fully mechanical” mean?
– Less maintenance 
– Higher durability 
– Stable behaviour even in extreme weather 
– A firing cycle that always behaves the same 

Ideal for speedsoft, milsim or players who simply want a replica that responds identically on the first shot and the eight-hundredth.

Key features of the XX-Mod HPA (ROSSI version):

Outstanding efficiency: 
Up to 800 shots with a standard 13Ci / 3000 PSI tank, a figure far above other mechanical systems.

Compatible with Gearbox V2 (M4): 
Designed to directly replace a standard AEG gearbox, allowing ROSSI to integrate it across the entire line without reinventing the replica.

Firing modes: 
– Semi 
– Auto 
No electronics or batteries required.

Magnet-based adjustable trigger: 
Allows adjustment of trigger distance and weight in minutes, compatible with most aftermarket triggers.

Tool-less design: 
Extremely fast installation and maintenance, perfect for players who want to optimise between matches.

Universal Hop-Up: 
Compatible with most Hop-Up chambers on the market, including MaxxModel.

Premium construction: 
– Anodised aluminium body 
– CNC machining 
– Distinctive blue colour 
– Made in Taiwan

Safety and control: 
Physical cutoff switch, integrated and accessible degassing system.

What changes for the player? 
The short answer: everything. 
The Neptune and Sentinel HPA will offer a replica that shoots identically every time, without variations caused by motor, battery or gear wear. An experience normally reserved for high-end replicas with expensive conversions, now available straight from the factory, guaranteed and with the ROSSI seal. 
  
Conclusion: ROSSI’s most aggressive move to date? 
Probably yes. 
Putting a MechLabs XX-Mod HPA into two complete lines (one premium and one economical) changes the rules of the game. ROSSI turns HPA into something accessible, stable and, above all, ready to use. No strange mods. No DIY. Just connect, adjust and play.