Butler Creek Flip-Open Objective Scope Cover, Size 17, 40.90mm

The Butler Creek Flip-Open Objective Scope Cover (Butler Creek part no. 30170) is a Size 17 objective lens cover custom fit to scopes with a 40.90mm objective bell, built to shield the glass between shots. Butler Creek molds this cover from tough black polymer and shapes it to snap open with a single touch of the thumb, so you’re never fumbling with a cap when a shot presents itself. A watertight, airtight seal keeps rain, snow, and trail dust off the lens until the moment you need a clear sight picture, and the hinge stays silent so the cover doesn’t spook game or draw attention on a stalk. It’s a simple, purpose-built way to protect a scope that sees real field use.

Key Specifications

• Molded as Butler Creek’s Size 17 fit-chart listing, sized to a 40.90mm objective bell.
• Custom fit for a 40.90mm objective bell, matching the scope’s own measurement rather than a generic universal size.
• Molded from black polymer for a durable, lightweight cover that won’t rust or corrode.
• Uses a slip-on mounting style, no tools or adhesive needed to install or remove it.
• Forms a watertight, airtight seal over the objective lens, keeping rain, snow, and dust off the glass.
• Opens with a single touch of the thumb via a spring-loaded, flip-open lid.
• The hinge operates silently, so opening the cover won’t spook game or give away your position.
• Ships at a featherlight 0.0625 lb, adding almost nothing to a scope’s overall weight.
• Cold-weather tested to -40 degrees F, holding up through genuine winter field conditions.
• Butler Creek builds these to a fit tolerance of 0.01 inch under to 0.025 inch over the listed measurement, so the seal stays snug.

Frequently Asked Questions

How do I know this is the right size for my scope? Butler Creek lists it as Size 17, built specifically for a 40.90mm objective bell on the objective bell.

Does the cover make noise when it opens? No, Butler Creek built the hinge to operate silently, which matters when you’re glassing game at close range.

Will this keep water and dirt off my lens? Yes, it forms a watertight, airtight seal over the lens and has been cold-tested to -40 degrees F.

Buy the Butler Creek Flip-Open Objective Scope Cover, Size 17, 40.90mm

Keeping a scope’s glass clean and dry between shots is a small detail that pays off the moment weather turns, and this Size 17 Flip-Open cover handles it without adding bulk. Order it from our Butler Creek lineup, part of our full selection of scope accessories and parts, from our Lubbock, Texas gun shop, and it ships fast to your door.