Parker Single Trigger Question

[Bob Jurewicz]

I just purchased a DHE 20 GA with single trigger. The trigger position is far back, like just about touching the inside rear of the triggerguard.
My question is: Is trigger position ( front to back) adjustable on these "Parker Single Trigger Systems"?
Bob Jurewicz

[Twoatlow8]

Not adjustable, they made trigger blades for the single trigger in any position.
However If not specified the default seems to be the rear position.
This is my conclusion from years of observation.