Greetings All: Just picked up a brand new Mossberg 500A with the Knox Sidewinder drum kit. Fellow had it and never used it, brand new condition, not even a scratch, $200 cash with extra magazine and other goodies like long barrel and wood furniture for shotgun. My question is will this gun take 3" shells along with the 2 3/4" shells? No where on gun does it say?, hopefully it will. My new Home Defense weapon, THANKS in advance,,,,,,,,,,,,,LastCast Army Ranger Recon, Class of 67.