TargetTalk

I have a adjustable iris on my fwb 300 The red dot is at 3.75 and wont move. Is there a trick or is it jammed? any help would be appreciated

I take it this is a foresight iris? What iss the maximum size? It might be an idea to remove the iris from the foresight tunnel, to see it more clearly. There may be something jamming the mechanism.