Hm. I never thought it would be my BBU. I'm using an ILLusion Kinetics lightweight BBU and doubt its that but I'll check it anyway. Weird things could happen in the cold I suppose. I uninstalled the KM high flow valves and put in the stock one and its the same... actually worse outcome. It fires weaker and doesn't even eject the BB. I fired 10 blank weak shots until finally the slide didn't have enough power to rock back which resulted in a half cocked hammer and an un-fireable gun.
The nozzle is an Airsoft Surgeon one... and the spring is a little weird. That actually results in weak shots?
The ultimate measure of a man is not where he stands
in moments of comfort and convenience, but where he
stands at times of challenge and controversy.
- Martin Luther King, Jr.