No.4 fore end wood patching under chamber

[muffett.2008]

Yeah Bow, preshape to a good fit around the chamber, ensure the block is a neat fit in the stock, cutout should be stepped to ensure block bottoms on ledge.
When happy, apply glue and start block in cutout, use the action to push home, locking screws tight.
You should need to do only minor finishing work. Don't forget a smear of grease on metal to prevent glue from bonding to action.