RT going full auto when air up - Please Help

[BartManSr]

As soon as I air (2800 psi) up my RT (0ld style) it goes full auto. It's been setting about 18 months. Yes I cleaned it and install all new O'rings today. I've tried to research this problem in the form, but had no luck.

Any suggestion would be appreciated.

[Predater]

check the bolt and sear. them are the 2 most common probs. if not it could be the trigger rod but i doubt that.