The Rossi M4 Sentinel 5.5″ TAU Black is an electric airsoft assault replica styled after M4-type rifles and marketed under the Rossi Sentinel name. Built as an AEG (Automatic Electric Gun), it combines a robust construction with typical M4 ergonomics and features like a CNC-machined handguard, polymer folding sights, collapsible stock, and hi-cap BB magazine. Internally, it uses a Version 2 gearbox with an electronic trigger unit and reinforced components designed to provide consistent performance in airsoft gameplay. Its compact 5.5″ handguard and lightweight build make it suitable for CQB (close quarters battle) and general field use in airsoft skirmishes.
Feature
Specification
Brand/Manufacturer
Rossi (airsoft AEG)
Model
M4 Sentinel 5.5″ TAU Black
Type
Airsoft electric rifle (AEG)
Operating System
Electric gearbox V2 with electronic trigger & active brake
Gearbox Components
18:1 steel gears, 14.5-tooth steel piston, 8 mm metal bushings, QD spring guide
Barrel
Precision inner barrel (6.02 mm diameter, ~190 mm length) with metal outer barrel
Handguard
CNC 5.5″ metal with accessory capability
Sights
Polymer folding front/rear
Receiver Material
Polymer body with metal components
Stock
Collapsible nylon fibre stock with polymer tube
Magazine
Metal hi-capacity magazine, ~300 BB capacity
Weight
~1950 g (approximate)
Length (adjustable)
~610–690 mm depending on stock position
Caliber (BB)
6 mm airsoft BBs (standard)
Intended Use
Airsoft gameplay (CQB/field)
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