O.S GT22 Petrol W/E 5040 SilencerBringing the OS petrol engine technology into the smaller class of model, the OS GT 22 has all the sophistication that you would expect from OS in terms of quality of manufacturer and innovative design yet manages to combine it all in a compact, powerful package. Like the GT 33, the GT 22 has a steel liner for durabilty, a lightweight, ringed piston and a one piece crankcase. OS are the masters of optimising internal designs in a way that allows