Just upgraded by j9 m4 today with a new o ring and 1.3 unequal.
All working beautifully, only gripe is that after i stop firing, about 40% of the time an extra ball will fly around 2/3 metres.
Its gonna be really annoying if i shoot over the top of a team mate and then the last one drops to their head.
Any advice i’d appreciate!
Does it sound like your gears are still spinning after shooting?
Wonder if your anti reverse is not engaged correctly.
Does it make a wired noise once you release the trigger that it didn’t make when it was new?
If it’s not the above comment from macgyver, check the gel size could be too small.