Butler Creek Flip-Open Eyepiece Cover, Black Polymer, Size 10 (1.51"/38.50mm) - Model 20100

A Butler Creek flip-open eyepiece cover keeps your scope's back lens clean and protected during field days, transport, and storage. This Size 10 cover (1.51"/38.50mm diameter) fits most popular riflescope eyepieces and springs open instantly with a finger flick—no fumbling, no tools, no removing the scope from your rifle. Black polymer construction resists weather, dust, and moisture without adding weight or bulk to your setup.

Hunters and shooters rely on scope lens covers to prevent scratches, smudges, and environmental damage that degrade optical clarity and zero. The flip-open design lets you stay behind the gun longer; you're not hunting for a lost lens cap in your pack or risking fogged optics because your cover doesn't seal. Butler Creek's simple, proven mechanism has been standard issue on working rifles for decades.

The Model 20100 fits eyepieces in the 1.51" diameter range. Measure your scope's eyepiece or objective bell (the larger, rear lens housing) to confirm the right size—Butler Creek offers ten sizes across common scope types. Covers are sold separately for eye and objective positions, so you can protect both ends or just the exposed lens you need.

Key Features

• Spring-loaded flip-open design stays clear of your sight picture and cheek weld
• Durable black polymer withstands field weather, dust, and moisture
• Lightweight and compact—no penalty to your rifle's balance or handling
• Fits 1.51" (38.50mm) diameter eyepieces
• Objective and eyepiece covers sold separately

Specifications

Frequently Asked Questions

How do I know if Size 10 fits my scope?

Measure the diameter of your scope's eyepiece (the rear lens housing). Size 10 covers fit eyepieces that are 1.51" (38.50mm) in diameter. Butler Creek offers ten sizes; use the chart on the product packaging or website to match your scope.

Do I need a cover for both the eyepiece and objective?

Eyepiece and objective covers are sold separately. You can protect just the exposed rear lens, both ends, or any combination based on your needs. Most hunters carry at least an eyepiece cover to keep dust and scratches off the lens you look through.

Will the flip-open cover get in the way when I'm shooting?

No. The spring mechanism pushes the cover open and completely out of your sight line when you flip it. The design is engineered to stay clear of your cheek weld and scope body.

What's the difference between Butler Creek flip-open and snap-on covers?

Flip-open covers attach permanently and spring up instantly when you flick them—no loose caps to lose. Snap-on covers are removable but must be found and stored separately when shooting. Flip-open suits active field use; snap-on suits storage and transport.