Rossi M4 Neptune MARSOC-T 9 inch Black

The Neptune MARSOC-T is a robust, feature-packed CQB-ready AEG with impressive build quality and out-of-box performance. Its metallic construction, modern internals, and modular handguard make it ideal for both beginner upgrades and serious play - even if occasional charging-handle tweaks might be needed. If you're after a compact, potent rifle for skirmishing, this is a great pick.

Build & External Features

• Construction: Full-metal body - zinc alloy receiver and CNC-machined Daniel Defense-style 9″ handguard in anodized black - offers durability and authentic aesthetics

• Muzzle Design: Distinctive Surefire SOCOM RC-style four-prong flash hider adds a tactical edge and is compatible with QD silencers

• Folding Metal Sights: Entry-level flip-up front and rear sights are ready for use out of the box

• Stock Assembly: Crane-style nylon-fibre stock mounted on a metal stock tube; length varies from ~720 mm collapsed to ~800 mm extended

Internals & Performance

• Gearbox: Reinforced with CNC gears; equipped with 8 mm metal bushings, a steel-tooth piston (POM head), and quick-change spring guide with bearing

• Trigger System: ETU electronic trigger with MOSFET and active brake ensures crisp trigger response and supports high-rate fire (approx. 25 000 rpm motor)

• Barrel & Hop-Up: Precision 6.02 mm inner barrel with fully adjustable hop-up enhances accuracy across ranges

• Velocity: Shoots approximately 330 fps when using 0.20 g BBs - ideal for CQB and outdoor play

Handling & Usability

• Weight & Dimensions: Weighs around 2.6 kg; compact and well-balanced for mobility in CQB settings

• Controls: Ambidextrous, with safety/fire selector and charging handle (note: some users report it may not fully seat on every pull).

• Magazine: Usually supplied with 1-2 mid-cap polymer mags; no hi-cap included in UK kits

Build Quality Insights

UK retailers note the high-grade manufacturing process, with precisely matched pin alignment and minimal body wobble - thanks to CNC-drilled parts ensuring tight tolerances.

Summary Table

• Feature
  Specification
• Construction
  Full metal (zinc alloy) with CNC 9″ DD-style handguard
• Muzzle
  Surefire SOCOM RC-style flash hider
• Internals
  Reinforced gearbox, CNC gears, 8 mm bushings
• Trigger System
  ETU w/ MOSFET & active brake, high-speed motor
• Barrel & Hop-Up
  6.02 mm precision barrel, adjustable hop-up
• FPS
  ~330 fps (0.20 g BBs)
• Fire Modes
  Safe / Semi / Full-auto with MOSFET control
• Stock & Sights
  Adjustable crane stock, folding metal sights
• Weight & Size
  2.6 kg, 720-800 mm adjustable
• Magazine
  1-2 mid-cap included