Just read Joe's post. Not correct. "Open "class can have both single action or dao capacity or dao capacity only. They DON'T weigh the triggers for open class.In the other matches the triggers have to weighed(Dist.,Stock,Service,etc.) You can shoot these matches with a dao gun. However if you have single action capacity they will weigh the trigger. With the revolver it has to pick up 2.5 lbs and the semi-auto 3.5 lbs. If the gun has been altered in any way it came from the factory for dao(revolver)then it will not be allowed. If the gun is manufactured for dao then it can be used, as applies to some semi-autos that come dao from the factory.
If a semi-auto has double action capacity first shot, then that is the way it has to be shot. The trigger on this type will be weighed then because it has single action capacity too.
I am talking about N.R.A sponsered matches with N.R.A. refs.