TM Hi-capa 5.1 GBB Cycle Problems...
 

I own a Hi-capa 5.1 with FMU. It has started to double feed bbs on each cycle if I manually pull back slide...one will go downrange at a nice 300fps+, and the other simply dribbles out of the barrel. If I simply try and shoot in semi-auto mode, the slide cycles very strongly, but the bb just dribbles out the end of the barrel. Will only go back to full stop position on slide if manually pull back slide to chamber all bbs in mag; but of course then I also get the 2nd bb dribbling out the barrel. Metal slide with stronger spring and trigger spring. Worked perfectly until just recently... Any ideas...?

Liam

Try using your stock spring..just to see if the problem still occurs.I actually cut my 150 spring down on my capa just a bit longer then the stock one.