Description
Rossi M4 Neptune DEVGRU-BK 9 inch (ETU Programmable Trigger – Black)
Rossi M4 Neptune DEVGRU-BK 9 inch (ETU Programmable Trigger – Black)
Overview & Key Features
According to the listing by MaxAirsoft, this model is a full‑metal M4‑style (DEVGRU/416) replica featuring:
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A Gen2 gearbox equipped with a Quick Spring Change (QSC) system and a rotary hop‑up chamber for rapid adjustments and maintenance.
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A programmable electronic trigger (ETU) system and MOSFET for improved trigger response and firing control.
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A 6.02 mm precision inner barrel and a high‑speed motor to a solid balance of accuracy and rate of fire.
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A retractable telescopic stock with internal battery space, a free‑float handguard, and folding front and rear sights.
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Comes with 2 × 120‑round mid‑cap magazines, but battery and charger are not included.
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Offered with a 1‑year warranty from the seller.
And more precisely, the technical specs are:
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Power: Approximately 0.9 J (around 300 fps with 0.20 g BBs)
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Effective Range: Up to ~50 m
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Length: Adjustable between ~740–810 mm
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Weight: Approximately 3.08 kg (3080 g)
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Battery Type: Compatible with 7.4 V or 11.1 V LiPo batteries
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Fire Modes: Safe, semi‑auto, and full auto.
Notable Design & Build Elements
A feature spotlight from 0’20 Magazine highlights:
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A CNC-machined, anodised 9″ Daniel Defense-style handguard with full RIS on all four sides, giving both strong aesthetics and practicality for accessories.
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A muzzle styled after the SureFire SOCOM RC4 prong design, with QD compatibility for attaching silencers like KAC-style suppressors.
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CNC internal upgrades, such as 8 mm bearings, an all-metal piston with metal teeth, and a reinforced POM piston head with a bearing—boosting durability and smoothing operation.
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Inclusion of a spring guide with bearing for quick spring adjustments, an aluminium nozzle with gasket, and a high-precision trigger setup delivering average around 330 fps output with the 6.02 × 270 mm barrel.
The Rossi M4 Neptune DEVGRU-BK 9″ seems to offer a strong combination of robust construction, internal upgrades, and out-of-box functionality, all at a competitive price point. The programmable trigger and MOSFET, plus the handy quick spring change system, make it appealing for players wanting both performance and customization.