[FirestormX]

I recently bought two Echo1 P90s off two different people (both were fairly cheap, so I grabbed them), but I've run into two problems with their firing. I went to open it up to take a look, but it seems they need a 3mm allen key, which happens to be the key that is missing from my set, so I need to pick up a new one.

I thought I'd ask here while I get around to buying a new set, so I have an idea of what to look for when I finally sit down with a youtube video and open it up.

The problem with one P90, is that it only shoots in fully automatic, and nothing happens when I switch it to semi. I looked around a little, and from the sounds of it, the P90 will go fully automatic when you pull the trigger all the way, and switching to semi only blocks the trigger from being depressed all the way. There might be a problem with the contact for the trigger not reaching when it's in semi, or something. Does that seem like a likely cause?

The problem with the second P90, is that when I put the battery in and pull the trigger, 99% of the time nothing will happen. But occasionally it will fire once or twice. The trigger depresses fully, the battery is charged fully, I've tried different batteries (including the one that works in the first P90), and there is no sounds (ie a clicking) from the motor.

Aside from reading about gearboxes on ASC, the only experience I have with opening them up and working with them is the upper gearbox of an ICS split...So my knowledge is enough to understand/know how to look up what is suggested to fix it, but I don't have the sense to recognize where the problems are coming from.

Thanks for any advice.