I bought a brand new Ithaca defense model 37 that came with a synthetic stock and forend. I replaced the synthetic furniture with wood furniture and have yet to fire this gun. Testing out all the functions of the gun I’m unable to put any shells into the chamber from the magazine tube. I gave it a closer look and it the shell stop does not depress when the action moved forward and back. I have to press down on the shell stop with my finger in order to release any shells from inside the magazine. Am I missing something here? Did I mess up the action after replacing the forend since the slide assembly has to be removed?