Dodgy Full Auto WE SA80 L85

[Fhe92]

Anyone know how to fix / link replacement part for fixing dodgy firing selector? It fires a few rounds and almost sort of locks up? I also have done a bolt mod to fix the sticking issue

 

[straffham]

Might be a daft question but are you sure its not just down to cold temperatures affecting the gas pressure?

 

[BBrotherwood]

If you have an NPAS in there you might also have it restricting too much gas, a mistake I made and I had a similar experience to yours on full auto.