tm glock 18c aep wont fire
 

I just opened up the mechbox of the tm g18c aep and literally replaced everything with nineball parts. Once I closed it up, it won't fire using the 7.4 500 mah battery for it. The only time it can be fired is with a lipo battery i temporary rewired to. Anybody know what's going on here?

sounds like it could be shimmed to tight, motor needs more juice to turn the gears. try to see if you can turn the gears while its assembled to see how much resistance there is. More data would be helpful

Did you replace the spring? If so, it might be too strong for the weak 200mah battery that ships stock with the gun. Try putting back the original spring in, if it shoots alright with the stock battery, there's your problem.

yes I have replaced it with the nineball spring which probably be too strong, but even when i downgrade to the stock one, it won't budge