How do you assembel 620 Stevens 12 gauge?

To assemble a Stevens 620 12 gauge shotgun, start by ensuring the firearm is unloaded and the action is open. Next, attach the barrel to the receiver by aligning the barrel's lug with the corresponding slot in the receiver and then rotating it until it locks into place. After that, insert the forend by sliding it onto the magazine tube and securing it with the forend nut. Finally, check that everything is properly tightened and functioning before use.