The 
Rossi M4 Sentinel SIGMA AEG (Tan)
 is a versatile, lightweight airsoft rifle featuring a reinforced polymer body and a CNC-machined aluminium handguard. It is highly regarded for its out-of-the-box performance, often including an electronic trigger unit (ETU) with an active brake for improved response.
 
Muzzle Velocity: Typically shoots around 320–330 FPS using 0.20g BBs.
Internal Components: Equipped with 18:1 steel gears, a piston with 14.5 steel teeth, 8mm metal bearings, and a 6.02mm precision inner barrel.
Dimensions: The rifle features an adjustable length of 650mm to 730mm and weighs approximately 2000–2005 grams.
Battery & Magazine: Utilises a 300-round high-capacity magazine; however, a battery and charger are usually not included and must be purchased separately.
Customisation: Includes an M-LOK handguard for mounting accessories and a quick spring change system for easy field adjustments.