In this video, Mecanica 6mm reviews the Neptune 10" Plus from Rossi, an airsoft gun with a 10-inch barrel and a programmable electronic board. He tests the gun’s range, accuracy, and performance before and after preparing it with 6mm Mechanics. He also shows the internals of the gun, including the connector, shimming, motor, gearbox, piston, cylinder, air nozzle, o-ring, gears, and hop up chamber. He explains how he completed the preparation, supported the mold on the hop up chamber, and attached the battery tip. He also discusses the external part of the gun, the external pipe clearance problem, and how to solve it with 3D printing or by contacting Gabriel, Clayton, or Wagner. He concludes with his final thoughts on the Neptune 10" Plus and its 3D file.