This airsoft gun from S&T is a 1/1 scale high performance gas blow back rifle based on the M4A1. This has a semi & fully automatic shooting mode with a polymer upper & lower receiver. The metal 245mm outer barrel with 45mm flash suppressor is covered by metal 185mm RIS handguard with 4x rail covers. This has a polymer pistol grip and a retractable sliding stock. The rear sight is detachable and adjustable. This comes with a 50 round gas magazine.