Replacing Forend
 

Dean,

The hammers are cocked. When the barrels are attached to the receiver I cannot attach the forend. I can remove the barrels from the receiver, pull the extractors out on the barrels to the ejected position and am able to attach the forend. With the forend attached, using a block of wood, I attempt to push each extractor back into the recess position but they will not lock and stay in the recess position.

Denis Potter posted on this thread explaining this solution.

Problem solved. The hammers on the forend were not fully cocked,even though they appeared to be. Lesson learned.