Under the metal barrel are 3 inner barrels with fixed hop up which allows the users to switch from 3 rounds or 6 rounds per shot by a flick of a lever located inside the ejection port

The Nine Ball tight bore power barrel reduces the amount space around the BB to increase the overall air pressure behind the BB itself

Vented slide design that reveals the golden fluted outer barrel

Proline Gen-2

COLOR: OLIVE DRAB GREEN

Lancer Tactical Gen 3 M-LOK 10" Airsoft M4 AEG (Color: Tan) USLR-A69361G Under the metal barrel areSpecifications Brand: Lancer Tactical Operation: Electric Automatic Construction: Nylon Polymer Frame Metal Barrel Assembly Firing Modes: Semi Automatic, Full Automatic, and Functioning Safety Muzzle Velocity: 380 400 FPS (w 0. 20g BBs, high FPS spring *installed*), 330 350 FPS (w 0. 20g BBs, low FPS spring *included*) Magazine: 130 Round High Speed Mid Capacity Magazine (Compatible with most M4 magazines) Battery: 11. 1v Stick Lipo Recommended