Lancer Generation 2 ProLine Series An evolution compared to the standard Gen 2 model, the Generation 2 ProLine has features and qualities unseen in previous Lancer rifles, giving rise as a welcome addition to the Lancer Tactical family! This series features a full metal barrel assembly, upper and lower receiver, a full metal handguard and a CNC machined buffer tube. Created with a realistic feel and classic design, the ProLine series are upgraded with reliable and responsive internals, making it a must-have for airsoft M4 users and enthusiasts!