How do I ensure the Butler Creek BC33940 fits my riflescope correctly?

The BC33940 is specifically engineered with a flexible Multi-Flex collar to fit objective bell outer diameters ranging from 2.220 inches to 2.250 inches (56.4 mm to 57.2 mm). Before purchasing, carefully measure the outside diameter of your scope's objective bell using calipers, as bells outside this precise tolerance range will either slip off or fail to seat securely.

Can I use this objective cover on the rear eyepiece of my riflescope?

No, this model is designed exclusively for the front objective bell of your riflescope and is not compatible with ocular eyepiece lenses. Eyepiece lenses require dedicated covers featuring a different design and release mechanism.

How does the Butler Creek Multiflex hold up in extreme Australian outback weather conditions?

Built from a rugged polymer with a flexible elastomer friction-fit collar, the BC33940 maintains full operational integrity down to -40 degrees Fahrenheit. It creates a reliable watertight and airtight seal that protects your objective glass from heavy dust, mud, rain, and debris during demanding hunts in harsh environments.

Does this lens cover require any batteries or special maintenance during field use?

No power requirements or batteries are needed, as the cover relies on a pure mechanical stainless spring hinge that pops open instantly and silently with a thumb flick. Maintenance simply requires wiping the rugged polymer free of grit or mud after use to ensure smooth spring-loaded operation in the field.

Scope Lens Cover - Butler Creek BC33940

The Butler Creek Multi-Flex Flip-Open Objective Lens Cover (Size 39–40, Model BC33940) provides airtight and watertight environmental protection for riflescope front glass. Engineered with a flexible elastomer friction-fit collar, this scope cap accommodates outer objective bell diameters measuring between 2.220 inches (56.4 mm) and 2.250 inches (57.2 mm). Weighing less than 1 oz (~28 g), it maintains optical clarity in harsh field conditions without adding noticeable bulk, utilizing an internal stainless spring hinge that deploys the cover silently with a touch of the thumb.

Key Features

Multi-Flex Elastomer Collar: Spans sizing tolerances from 2.220 in to 2.250 in (56.4 mm to 57.2 mm), ensuring a tight friction-fit seal over varying scope bell dimensions.
Instant Spring-Loaded Hinge: Built-in stainless spring action snaps the lid open instantly and silently to prevent spooking game.
Environmental Lens Sealing: Creates a semi-O-ring seal against moisture, dust, snow, and mud to protect multi-coated objective glass during transit and stalking.
Sub-Zero Reliability: Tested to maintain operational flexibility and structural integrity in temperatures down to -40 °F (-40 °C).

Specifications

Product Name: Butler Creek Multi-Flex Flip-Open Objective Lens Cover (Size 39–40)
Model Number: BC33940
Objective Bell Fit Range: 2.220 in to 2.250 in (56.4 mm to 57.2 mm)
Weight: Less than 1 oz (~28 g)
Material: Polymer housing with flexible rubberised collar and stainless steel spring hinge
Operating Temperature Limit: Down to -40 °F (-40 °C)
Power Requirements: None (mechanical)

Who is the Butler Creek Multiflex Flip Open 39-40 Objective for?

Big game hunters — Requires watertight and dustproof sealing across extreme climates down to -40 °F, protecting objective glass while keeping total added weight under 1 oz during active stalks.
Varmint and precision rifle shooters — Relies on a rapid-deployment riflescope objective lens cover designed specifically for objective bells measuring between 2.220 in and 2.250 in to enable instant, silent target acquisition.

Less suitable for: Riflescopes with outer bell diameters below 2.220 inches or above 2.250 inches (which require different sized objective covers), or shooters seeking protection for the rear ocular lens, which requires a dedicated push-button ocular flip cover.

SKU	BCK40160LP
Model #	BC33940
Brand	Butler Creek
Shipping Weight	1.0000kg

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Butler Creek Bc33940 Multi-Flex Lens Cover Size 39-40

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