Just bought a new Mossberg 500 today. The deer/turkey combo in realtree AP camo. Got home from my dealer and found out the rear sight on the slug barrel is jacked up. It has about a 1/2 play in all directions. I'm not talking about the adjustments. The whole Williams sight moves. I have never had a problem with a new firearm but I am assuming I have to deal with the manufacture. So my question is has anyone had this problem and how is Mossberg's customer service. I am pretty bummed out because I planned on using it next weekend for out bonus 2 days shotgun weekend in Ohio. Any info is appreciated. Thanks.