Upon removal of the bolt from the action, take a small brass hammer and tap the cocking lug out of its detent notch at the rear of the bolt, allowing the striker to go forward to the fired position.
Drift out the cross pin that retains the bolt head.
Remove the bolt handle and striker assemply toward the rear. It the assembly is tight, use a plastic hammer to tap it gently off.
Grip the front portion of the striker firmly in a vise. Push the bolt handle sleeve toward the front until the cocking piece is exposed. Remove the semi-circular key from the top of the cocking piece and unscrew the cocking piece from the rear of the striker shaft. CAUTION: Keep a firm grip on the bolt handle, as the striker spring is compressed.
Slowly ease off the tension of the striker spring and remove the striker and spring from the front of the bolt handle unit.
Some models of the 340 design have a clip-on extractor unit and others have a hook-in type with a spring and plunger at the rear. To remove this type, restrain the plunger and spring, pivot the extractor out toward the right and take it off. The clip-on type is simply pried out of its recess for removal.
The gas shield is retained on top of the body by two cross pins and mounted on twin rings which encircle the bolt. The cross pins are usually staked in place, so if removal is desired, be sure the shield is well supported while driving out the pins.
When the front gas shield cross pin is drifted out, the gas shield key and its spring will be released along with the shield.
Hope this helps with your project.
BTW - Welcome to the board!