I need to bump this thread. I'm still having efficiency issues.
I've have 3 mongo redux powertubes, 3 lapco cupseals, 3 cci cupseals, and a full madmann autococker spring set. I also have a CCI spring set.
I tried the above spring combo (red main, blue valve) and the gun would cock without air and would get terrible efficiency.
Anybody got any other combos I should try?