Butler Creek Flip-Open Eyepiece Cover, Size 11 (1.55"/39.40mm), Black Polymer (Model 20110)

The Butler Creek Flip-Open Eyepiece Cover (Model 20110, Size 11) is a quick-access lens protector designed for hunters and shooters who need instant clarity without fumbling. This eyepiece cover fits scopes with 1.55" (39.40mm) objective tubes and combines a silent, thumb-operated flip design with a secure friction mount that locks onto your scope body — so the cover stays put until you need it off.

Built for real-world hunting and shooting conditions, this black polymer cover uses an air-tight semi-O-ring seal to keep dust, moisture, and debris away from your glass when you're glassing in the field or waiting on game. The friction-fit mounting system holds tight without any tools, and the spring-hinged flip mechanism is designed to operate silently — no clicks, snaps, or noise that could spook a wary animal at a critical moment. Whether you're hunting in wet weather, dusty terrain, or sub-zero cold (tested to –40°F), the cover protects your optics investment without adding bulk to your rig.

Weighing less than an ounce, the Butler Creek Size 11 won't impact your rifle's balance or add noticeable heft to your pack. The design is fully ambidextrous, so it works equally well whether you're right- or left-eye dominant. If you run a spotting scope alongside your rifle, Butler Creek makes compatible covers in other sizes, so you can standardize your lens protection across your kit.

Key Features

• Fast flip-open design with silent spring hinges
• Custom friction-fit mount anchors securely to scope body
• Air-tight semi-O-ring seal keeps out dust and moisture
• Water-resistant protection in extreme weather and cold
• Weighs less than one ounce
• Fully ambidextrous operation
• Black polymer construction

Specifications

Frequently Asked Questions

Will this eyepiece cover fit my scope?

The Butler Creek Size 11 is designed for scopes with a 1.55" (39.40mm) objective tube diameter. Check your scope's specifications to confirm the tube size matches before ordering. Butler Creek makes multiple sizes for different scope models, so verify you have the correct size for your setup.

How does the cover stay attached to the scope?

The cover uses a custom friction-fit mounting system that grips your scope's objective tube without tools or modification. The friction mounts are designed to hold securely during normal use while allowing you to remove the cover when needed.

Can I use this cover in wet or cold weather?

Yes. The cover's air-tight semi-O-ring seal is designed to keep out moisture and dust, and it has been tested to perform reliably in temperatures as low as –40°F. This makes it suitable for hunting and shooting in wet, snowy, or extreme cold conditions.

Is this cover ambidextrous?

Yes. The flip-open design works equally well for right- and left-eye dominant shooters, and the silent spring hinges function either way.