Originally Posted by Topgun 3006

Some just won't fit as tight as they should even when you get the correct match for the scope. I've had a couple like that and did what Nomercy448 mentioned by wrapping just enough electrical tape around the end of the scope tube so that when you push the cover on it will be good and tight. All my newer Leupolds have the $40 screw in covers that look fantastic and will never come off.