Butler Creek 30330 Flip-Open Scope Cover Objective Lens 51.90mm Slip On Polymer Black

The ultimate objective lens protection for hunters and shooters, Flip-Open scope covers are custom fit to your scope, create a watertight, airtight seal, and open with a touch of your thumb, so you can put your shot through the narrow window of opportunity in the most extreme conditions. The fast, flip-open design with a silent hinge keeps your eye on the target and won't spook game. It weighs less than an ounce and has been tested to -40 degrees F. The fit range is .01 under and .025 over the g