How do I ensure the Butler Creek Multi-Flex 30-31 Objective cover fits my specific rifle scope?

You need to measure the outside diameter of your scope's objective bell to ensure it falls strictly within the 49.80 mm to 50.70 mm (1.960" to 1.998") sizing envelope. The flexible thermoplastic sleeve provides a snug friction fit for this exact range, but if your bell measures outside these dimensions, you will need to step down to the 28-29 or step up to the 33-34 model.

Will this scope cover hold up against harsh Australian outback and alpine environments?

Yes, it is built for rugged field use, effectively sealing out abrasive red dust, spinifex grit, mud, and heavy moisture in both dusty outback and wet alpine stalking conditions. It is also rated by the manufacturer for sub-zero reliability down to -40°F (-40°C).

Can I install this Butler Creek Multi-Flex cover on the ocular eyepiece end of my scope?

No, this specific model (BC33031) is strictly designed for rifle scope objective bells and is incompatible with ocular or eyepiece bells. For the eyepiece end, you should look for dedicated Butler Creek Eye covers, such as the Butler Creek Flip Fast Open 18 Eyepiece.

Does this cover require any batteries or electrical compliance for use in Australia?

No, the Butler Creek Multi-Flex is a fully mechanical, unpowered optic accessory featuring a spring-loaded lid and dual finger tabs. Because it contains no electrical components, items like 240V compatibility, AU mains plugs, and SAA/RCM regulatory certifications are not required.

Scope Cover - Butler Creek BC33031

The Butler Creek Multi-Flex Flip-Open Objective Scope Cover (Size 30-31 Objective) is a non-powered mechanical lens cover designed to protect rifle scope objective glass from environmental contamination without slowing target acquisition. Featuring a pliable, stretch-fit thermoplastic collar, this cover bridges dual sizing steps to create a watertight and airtight friction seal over scope bells measuring between 49.80 mm and 50.70 mm (1.960" to 1.998") in outer diameter. Spring-loaded ambidextrous finger tabs allow the rigid lid to flip open instantly and silently with a single thumb flick, keeping optics clear of dust, mud, rain, and debris until the moment of firing.

Key Features

Dual-Size Multi-Flex Collar: Uses a flexible polymer sleeve that stretches to fit objective bells spanning 49.80 mm to 50.70 mm without marring the optic's finish.
Instant Spring-Loaded Action: Features ambidextrous thumb tabs for silent, rapid flip-up deployment in the field.
Environmental Friction Seal: Internal semi-O-ring design seals front glass against outback dust, spinifex debris, snow, and rain.
Extreme Temperature Reliability: Functions consistently in sub-zero environments down to -40°C (-40°F).
Lightweight Build: Adds less than 1 oz (~28 g) to the front of the rifle scope, preserving rifle balance and handling.

Product Specifications

Product Type: Flip-open rifle scope objective cover
Manufacturer Part Number (MPN): BC33031 / 33031
Fitment Range (Metric): 49.80 mm to 50.70 mm outer diameter
Fitment Range (Imperial): 1.960" to 1.998" outer diameter
Weight: Less than 1 oz (~28 g)
Operating Thermal Rating: Sub-zero reliability down to -40°C (-40°F)
Material: Flexible thermoplastic sleeve with rigid polymer lid
Power Requirements: None (fully mechanical)

Who is the Butler Creek Multiflex Flip Open 30-31 Objective for?

Spot-and-stalk hunters — Need an airtight, watertight flip-open cover that seals front glass against grit, moisture, and debris down to -40°C (-40°F) while adding less than 1 oz (~28 g) of weight to the rifle.
Long-range rifle shooters — Require instant, spring-loaded objective lens protection engineered specifically for scope bells with an exact outer diameter of 49.80 mm to 50.70 mm (1.960" to 1.998").
Field tactical operators — Require silent, thumb-actuated flip-open rifle scope covers that deploy instantaneously without disturbing the sight line or optic zero in harsh environments.

Less suitable for: Scope bells with an outside diameter under 49.80 mm (which require a stepped-down Multi-Flex 28-29 cover) or over 50.70 mm (which require a stepped-up Multi-Flex 33-34 cover), as well as ocular or eyepiece bells that require dedicated ocular covers.

SKU	BCK40158LP
Model #	BC33031
Brand	Butler Creek
Shipping Weight	1.0000kg

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Butler Creek Bc33031 Scope Cover Multi-Flex 30 31 Objective

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