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

Product Overview

The Rossi Neptune 10.5″ SAS T - HPA Edition (MechLabs XX-Mod) is a premium, factory-built High Pressure Air (HPA) tactical rifle engineered to deliver competitive-grade shot consistency, lightning-fast cycle rates, and complete mechanical reliability. Rossi circumvents the common complexities, electronic failures, and tedious alignment issues associated with aftermarket HPA conversions by integrating the cutting-edge MechLabs XX-Mod engine directly into their acclaimed Neptune SAS platform right from the factory floor. Housed in a robust, UKSF-inspired full-metal chassis featuring a monolithic-style upper receiver and an adjustable stock layout, this 10.5" barrel carbine strikes the ultimate balance between compact CQB maneuverability and mid-range outdoor performance.

The engineering core of this platform is the CNC-machined, Series 6 aluminum MechLabs XX-Mod engine. Operating as a 100% mechanical and pneumatic system, it functions entirely without batteries, internal wiring, or electronic fire control units (FCUs). This design renders the internal system completely waterproof and highly resilient against harsh weather conditions that would short-circuit electro-pneumatic alternatives. It features an advanced, adjustable magnetic trigger system that allows operators to mechanically fine-tune both the trigger travel distance and pull weight without tools, enabling a hair-trigger setup for high-speed tournaments or a heavier, tactile break for authentic MilSim training. The optimized pneumatics deliver high air efficiency—producing roughly 800 shots on a standard 13ci/3000 PSI tank setup—while maintaining near-zero FPS deviation across long continuous bursts. Crucially, the platform preserves wide system compatibility by accepting standard Version 2 AEG magazines and accommodating standard rotary hop-up configurations for easy downstream scaling. For B2B trade stockists, high-end skirmish arenas, and premium retail storefronts, this turn-key mechanical HPA solution is a top-tier flagship asset that caters to discerning operators wanting out-of-the-box tournament performance backed by full manufacturer structural assembly.

Technical Specifications & Materials

• Weapon Category: Factory-Integrated Mechanical High Pressure Air (HPA) Rifle Platform
• Model/Series Designation: Rossi Neptune 10.5″ SAS T — MechLabs XX-Mod Edition
• Pneumatic Engine Core: CNC-Milled Series 6 Aluminum MechLabs XX-Mod Engine
• Operating System Type: Purely Mechanical / Pneumatic Valve System (No Batteries, Wiring, or FCU required)
• Chassis Engineering: Full metal UKSF-style (L119A2 inspired) body with monolithic upper rail structure
• Barrel Profile: 10.5-inch tactical short-barreled carbine matrix
• Trigger Matrix Architecture: Magnet-driven adjustable return trigger (Mechanical travel and weight tuning)
• Air Management Layout: "Air Bender" cycle controller paired with high-efficiency XX-Mold Bolt synchronization
• Magazine & Feeding System: Fully compatible with standard TM-spec Version 2 AEG magazines
• Hop-Up Assembly: Adjustable Rotary Hop-Up interface (Compatible with premium aftermarket upgrade barrels/buckings)
• Operational Air Efficiency: Approximately 800 shots per standard 13ci/3000 PSI tank configuration (depending on regulator output)
• Firing Selector Modes: Safe / Semi-Automatic / Full-Automatic mechanical lever settings
• Muzzle Velocity Parameters: Regulated output typically spanning 301 - 350 FPS (Adjustable via external pressure regulator)
• Maintenance Architecture: Tool-less modular block disassembly with an integrated physical cut-off and degassing safety valve
• External Power Requirements: Requires a standalone HPA Tank, High-Flow Rig Airline, and Low-Pressure Regulator (Sold Separately)
• Package Includes: 1x Rossi Neptune 10.5" SAS HPA Rifle, 1x High-Capacity/Mid-Capacity Compatible Magazine, Operational Documentation Manual