Plastic nozzle is a bit quieter than its metal counterpart. It is a durable upgrade part that provides good air seal for stock and tuned airsoft guns. Deep Fire nozzle is a quality choice to replace your stock nozzle!
Check out nozzles article in Tradetech! You can find nozzle lengths of different manufacturers in an easy-to-read table which helps you to look for e.g. a longer nozzle for your gun, if the current nozzle is not the right size!