This nozzle is CNC machined from aluminum alloy EN AW 6012. Inside this nozzle is one sealing O-ring which stop loss of air during the shot and helps to increase FPS.Airsoft-Parts Air Nozzle - 29.1mmSKU: NOZ-29.1£3.99PriceQuantity*Out of StockNotify When AvailableInstallation NotesWe recommend lightly lubricating the o-ring with Super Lube liquid silicone oil.