I am still new to Red Dots. I put on a Holosun 407c-gr on a Walther PDP. So my question is it normal for them to be a lint and hair magnets? Even after I clean it, a hour later there is stuff on the optic. Sometimes its hard to see. I was wondering if this is just normal. Is where a way to prevent this? I am carrying in a Bare Arms OWB holster.