Can any one help me put my husbands 12 guage browning - field model - ejects from the bottom, shotgun back together? We took it apart and now when we are putting the last piece back into the gun (trigger portion), it will go into the gun all but 1/4" and then it stops. Last year a friend had to give it a pretty good little pop to get it in. But when we do that we are afraid it will break. It is not going in. Can you please help?