It is not a common problem that a forend will not go back into place after a Parker is disassembled but it does happen.  The problem is almost always seen on guns with ejectors.  

The force behind the ejector system comes from a cocked spring-loaded mechanism in the forend that snaps against the ejector rods.  These rods can be seen protruding from the from hinge area of the frame.  If while the forend is off the gun, one or both of these cocked mechanisms release, the forend cannot be reassembled until after they are both cocked again.

A technique to remember that seems to work in most cases, and is safe and easy to do; take the barrels off, pull the extractors out on the barrels to the ejected position and replace the forend assembly on the barrels and latch it. Then take a piece of wood, rest the muzzles on the carpet and and gently push each extractor back into the recess. The tumblers should now stay in a cocked position, and allow reassembly of the gun. But, if an ejector sear is broken, it may not stay cocked and they will need repair.

If the cocking process fails repeatedly, DO NOT try to fix the problem yourself.  Parker ejectors should be repaired by competent gunsmiths with experience repairing Parkers.

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