I don't think it is quite that simple. Way more than one I have handled can only be referred to as "Crunchy", feeling like something was wrong internally, even if it worked.
To be fair, it is not simply a problem on Parker repros, getting a single trigger right is tough on any gun.
I think the market has determined that the double trigger Parker Repro guns are worth more. But, it didn't start out that way.


Best,
Ted