Quick presentation by Taiwan Gun of the S&T Sports Line ST46 AEG available at their store... "The S&T ST46 is a budget line product, the replicas are made entirely of reinforced nylon. It has elements such as the lower receiver where we can find a unique serial number, upper receiver, pistol grip, stock tube, stock, sights, handguard, muzzle brake and manipulators which are all made in reinforced nylon. The replica fits very well and this construction allows us to have a replica below 3 kg. Check out three different models in our stock."