Watch what RandomGuyKev can say about the Lancer Tactical x SLR Rifleworks SD Gen4 AEG in 2 minutes. The Lancer Tactical x SLR Rifleworks SD Gen4 airsoft rifle represents an update over previous iterations, primarily featuring licensed external components and upgraded internals. Available in 9-inch and 13-inch variants, the rifle retails between $350 and $400. It distinguishes itself with an SLR rifle works licensed handguard and an NSR stock, giving the platform a cleaner appearance.