Hi all,
So I have just put an AirsoftPro twin lever hop unit in my CYMA 701b rifle. At the same time I upgraded the barrel to a X Fire 6.08 precision barrel. Put it all together and tuned the hop up unit, till it was firing like a dream. The tuning was done by manually feeding the bb's into the hop up one at a time for convenience (the twin arm hop unit has to be adjusted without the magazine on by allen key). So happy days so far.
I then found that when I put the magazine in, the magazine empties completely in one go as soon as the bolt is pulled back. All the bb's empty backwards into the body of the rifle. I think the problem is the notch in the hop unit as circled in my photo. Any ideas how to fix this problem?