Very informative information on this thread, I will stick around to learn and share information in regards to the S&T Type 64. I initially was planing on building a Type 64 DMR Variant (M1D scope and check rest) but after opening the gearbox and hop-up unit I kind of gave up on the ideal. However if anyone has information about the nozzle and hopup unit it would be greatly appreciated. At the current time I am not sure if the nozzle is proprietary, having a O ring Air nozzle would improve compression by a long shot. Hopup arm and bucking is strange and seems proprietary, bucking is a st