Sounds like you have an ejector gun. For the forend to install, both the ejector hammers on the forend as well as the hammers in the action need to be COCKED.
The forend. Hammers can be cocked by pushing back on the hammers with a block while the forend is in a vise or some other way of holding it.
The gun can be cocked by carefully opening the barrels while fully pushing in on the unhooking pin in the nose of the frame .
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B. Dudley
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