I recently purchased a Spingfield V12 in stainless.A couple of things concerned me.First,I notice some rust spots on the inner part of the slide.Should this happen on a new stainless gun.Second,I notice something on the rifling.It almost looks like pitting right past the chamber.It is on one of the lands.A brush would not remove it.The gun has 100 rounds through it.It is very accurate at 20 yards.3 inch groups.Should I worry about it.