A Butler Creek flip-open objective lens cover in Size 11 (39.10x34mm) is essential protection for any riflescope on a hunting rifle, tactical rig, or precision shooting setup. Unlike fixed caps that require two hands and take your focus off the target, this quick-access design lets you flip the cover open with your thumb while staying mounted and ready. Built from durable black polymer, it's engineered to seal out the elements—dust, moisture, and extreme cold down to –40°F—so your glass stays crystal clear when it counts.

The design philosophy is simple: speed and reliability without compromise. Silent spring hinges won't alert game in the moment before your shot. The custom-fit friction mount grips your scope's objective bell securely, while the semi-O-ring creates an air-tight, water-tight barrier that keeps your optics protected during pack-in, rough weather, or storage. And because it weighs less than an ounce, there's zero reason to leave it off your rifle. The ambidextrous spring mechanism works equally well whether you shoot right- or left-handed.

Whether you're hunting in wet, cold conditions, running a long-range precision rifle, or just protecting an expensive optic investment on a shelf gun, this Butler Creek cover solves the real problem: keeping your objective lens clean and fog-free while staying out of your way when it's time to shoot. Size 11 fits scope objectives measuring 39.10×34mm—verify your scope's objective diameter before ordering to ensure proper fit.

Key Features

• Fast flip-open design—ready in one thumb motion
• Silent spring hinges designed not to spook game
• Water-tight, air-tight seal with semi-O-ring technology
• Custom-fit friction mount anchors securely to your scope
• Tested to –40°F for extreme-condition reliability
• Truly ambidextrous operation
• Weighs less than one ounce
• Durable black polymer construction

Specifications

Product	Flip-Open Objective Lens Cover
Brand	Butler Creek
Size	11
Objective Diameter	39.10×34mm
Color	Black
Material	Polymer
Weight	Less than 1 ounce
Temperature Rating	–40°F and below
Mount Type	Custom-fit friction mount

Frequently Asked Questions

Will this cover fit my scope?

Size 11 Butler Creek covers are designed for objective lenses measuring 39.10×34mm. Check your scope's specifications or measure the objective bell to confirm the size matches before purchasing.

Can I use this cover on a left-handed or right-handed rifle?

Yes. The spring hinge mechanism is truly ambidextrous and works equally well from either side, so it'll function on any rifle regardless of shooting hand.

How does the cover stay on my scope?

The cover uses a custom-fit friction mount that grips your scope's objective bell securely without tools or modification. The semi-O-ring creates an air-tight, water-tight seal that helps hold it in place while protecting your lens from dust and moisture.

Will the spring make noise when I flip it open?

No. The spring hinges are designed specifically to operate silently, so you won't alert game or disturb your shot opportunity.