This is my SHS 13:1 ssg build. NEEDS A NEW MOTOR!!!! Other than that it’s a really good ssg. I can throw in a G&G etu for an extra 25 bucks. The parts list is as follows Internals: . SHS 13:1 SSG gearset . G&P cylinder and cylinder head . SHS o-ring nozzle . SHS tappet plate . SHS m120 spring . G&P piston . G&P piston head (aluminum) . G&P bearings . G&P spring guide . G&P trigger contacts Is shimmed perfectly and AOE has been corrected. Shoots 35-40 rps great ssg.