Classic army ca8-2 fire selector problem
 

alright so the gun fires full auto just fine, but when i try to shoot semi auto i have to adjust the nob so much until i hit a sweet spot for semi and it never stays there

I had the same problem with the same gun. What I did was pry the 'finger contacts' up slightly so they make better contact with the selector plate contact.

These finger contacts are two little prongs located near the front of the selector plate between the plate and the mechbox. As you slide the selector plate over these prongs, they make contact with the selector plate contact (strip of brass) and it completes the circuit. Over time/use these prongs get pushed down and don't always make proper contact in the semi-auto position and eventually the full auto.

Extremely easy fix. Just pop the lower with the mechbox out and I'm pretty sure you have access to pry those up slightly.

awesome thanks a lot. Ill try this now

all fixed thanks for the help man

No problem. I'm assuming prying up the finger contacts was the solution?

yup, hopefully it doesnt start to do it again over time or it could become an annoying thing to deal tih

You can flaten them down and just solder them togheter. They are useless in most guns.

Theses act as an extra safety in case the mechanical safety fails. But they are causing a whole bunch of problems in most guns.

Soldering them also prevent the selector plate from being damaged. Arcing occurs sometimes when using higher voltage/rate battries. That makes the little metal plate of the selector plate get hot and melt the plate. Then you are stuck with a problematic gun.