I have a question on a scope I was gonna get since it was such a good deal and keep it put back till my next American or 10/22 rifle. On the natchez shooters supply site there are two models of Bushnell Banner 3-9x40, one says 3-9x40 multi x black matte clam and the other says 3-9x40 multi x black matte clam sb. what would the sb mean? I think clam means clam pack but have no idea about sb. There are a 30 dollar difference in price and it's the same brand and model except one has sb after clam. thanks