Rossi Neptune 10.5″ SAS T - HPA Edition (MechLabs XX-Mod)

Rossi x MechLabs: The Future of Mechanical HPA

For years, moving to HPA (High Pressure Air) meant stripping your AEG, buying expensive kits, and spending hours tuning alignment. Rossi has changed the game. The Neptune 10.5" SAS HPA Edition comes pre-installed with the prestigious MechLabs XX-Mod, a fully mechanical CNC machined engine that transforms the reliable Neptune platform into a precision instrument.

Pure Mechanical Engineering The heart of this beast is the MechLabs XX-Mod engine. Unlike electro-pneumatic systems that require small batteries and FCUs (Fire Control Units), this system is 100% mechanical.

• No Electronics: You never have to worry about rain, dead batteries, or fried Mosfets. It runs purely on air pressure.

• Instant Response: The pneumatic valve system provides a crisp, instantaneous trigger snap that electric guns simply cannot replicate.

• Consistency: Whether it's your first shot or your 800th, the FPS deviation is practically non-existent.

Adjustable Magnetic Trigger One of the standout features of the XX-Mod is the magnet-based adjustable trigger. You can fine-tune both the travel distance and the pull weight in minutes, allowing you to set up a "hair-trigger" for speedsoft or a heavier, realistic break for Milsim—all without needing complex tools.

Efficiency & Compatibility Despite being a mechanical system, the efficiency is outstanding, offering up to 800 shots on a standard 13ci / 3000 PSI tank (tank size dependent). Crucially, because it is built on the Neptune chassis, it retains compatibility with standard V2 AEG Magazines and standard Rotary Hop-Up units (including high-end brands like MaxxModel).

The Classic SAS Platform All this tech is housed in the beloved Neptune SAS 10.5" body. Inspired by the L119A2 used by UK Special Forces, it features a monolithic-style upper, a comfortable Tan finish, and a sturdy metal construction that feels rock-solid in the hands.

Key Features:

• Engine: Factory-installed MechLabs XX-Mod (CNC Aluminium).

• System: Fully Mechanical / Pneumatic (No Battery Required).

• Modes: Semi / Full Auto.

• Trigger: Adjustable Magnetic Trigger (Weight & Travel).

• Body: Full Metal Neptune SAS 10.5" (UKSF Style).

• Maintenance: Tool-less design for easy access.

• Safety: Physical cutoff switch and integrated degassing system.

Note: Requires an HPA Tank, Line, and Regulator (sold separately) to operate.