Butler Creek 30390 Flip-Open Objective Lens Cover, Black Polymer, 56.40mm Size 39

The Butler Creek Size 39 flip-open objective lens cover is designed to protect your scope's front lens element during transport, storage, and in the field. This black polymer cover fits 56.40mm objective lenses and uses a spring-hinged flip design so you can expose your glass instantly when a shot opportunity appears—no fumbling with separate caps or covers that fall into the brush. It's built for hunters and shooters who need reliability in the field without compromise.

The custom-fit friction mount grips your scope securely while the semi-O-ring seal keeps dust and moisture out when the cover is closed. The spring hinges operate silently, so they won't alert game or distract you on the range. Butler Creek engineered these covers to function reliably even in harsh cold; they're tested to –40°F. Ambidextrous design works for left- or right-handed shooters, and the whole assembly weighs less than an ounce, so it won't add noticeable bulk to your setup.

This is a purpose-built accessory for serious hunters and precision shooters who demand their optics stay protected and ready. Whether you're glassing from a blind, hiking into backcountry, or running drills at the range, a quality objective lens cover is one of the simplest ways to extend the life of your scope and ensure your glass is clean and clear when it matters.

Key Features

• Flip-open design—access your scope lens in one motion
• Custom-fit friction mount holds securely on your scope
• Semi-O-ring seal keeps out dust and moisture
• Silent spring hinges—won't spook game or create noise on the range
• Ambidextrous hinge for any shooter setup
• Tested to –40°F for cold-weather reliability
• Lightweight—under one ounce

Specifications

Frequently Asked Questions

What size objective lens does the Butler Creek Size 39 fit?

This cover is sized for 56.40mm objective lenses. Butler Creek offers multiple sizes, so verify the manufacturer size on your scope or use their size chart to confirm the right fit for your optic.

How does the flip-open design work in cold weather?

The spring hinges are tested and rated to function reliably at –40°F and below, so you can operate the cover even in extreme cold without worrying about failure or stiffness.

Will this lens cover fit all scope brands?

The Butler Creek Size 39 is designed to fit 56.40mm objective lenses across most rifle scope brands. However, the custom-fit friction mount is engineered for standard scope tubes, so verify your scope's objective diameter matches before ordering.

Is the hinge spring silent?

Yes. The spring hinges are designed to operate silently so they won't create noise that could spook game or distract you during precision shooting.