I inherited a Charles Daly (Miroku) Superior 12 Ga SBT. This gun was my grandfathers go to gun for a long time. Lockup is pretty loose. Pulled it out of the safe in prep to get it looked at and after opening the lever is stuck to the right. The gun will now not close. Called Midwest Gun Works and was told they do not have the parts to fix. Anybody have any insight on who could work on this? Thanks for your time.