Not entirely sure this is the right place for this question, but since it's directly related to suppressors I'm putting it here.
I think I need a cover for my rifle can. I'm noticing significant heat shimmer or mirage when I get through 10 or so shots on my bolt rifle. Prices seem to run from $40ish to well over $100. I'd prefer to stay on the lower end, but not really sure what makes one better than another. The can is mainly used on a 308 bolt rifle with secondary use on a 223 AR. Mirage is more of an issue on the 308 because I'm using irons that are closer to the bore than the RDS on the AR.
So, what's serviceable without being expensive (relative to its competitors) and what makes this selection better than the others?
Chris