Will this Butler Creek Size 11 cover fit my standard circular 39 mm rifle scope objective?

No. This specific model is exclusively engineered for non-round, oval TV-view objective bells measuring 39.10 mm by 34.00 mm. For standard circular 39 mm or 40 mm lenses, you will need to select a round Butler Creek cap instead of this oval version.

How do I ensure my scope bell dimensions are within the correct tolerance before purchasing?

Measure your scope's outer objective bell carefully with calipers. This Size 11 oval cover accommodates outer dimensions within a precise range of -0.25 mm to +0.64 mm, meaning it fits bells from 38.85 mm x 33.75 mm up to 39.74 mm x 34.64 mm.

Does this flip-open cover perform reliably in freezing Australian alpine conditions or extreme outback heat?

Yes, the rugged matte polymer body and internal stainless steel spring hinge are manufacturer-tested to operate reliably down to -40°C. While it handles typical Australian field heat easily, keep in mind that extreme sub-zero temperatures below -20°C can make polymer hinges more brittle under heavy direct impacts.

Are there any electrical compliance requirements or Australian certifications needed for this scope cover?

None at all. This is a 100% mechanical optic accessory containing no electronics, so it does not require battery power, electrical approvals, or SAA/RCM compliance for use across Australian states and territories.

Oval Scope Cover - Butler Creek BC30110

The Butler Creek Flip Open 11 Objective (Oval Shape) is a specialised optic lens cover engineered specifically for vintage and non-round wide-field rifle scopes, including classic TV-view objective bells. Designed to shield glass from dust, rain, mud, and glare in demanding field conditions, it features a spring-actuated flip lid that deploys quietly via ambidextrous thumb tabs. The opaque, matte black polymer construction incorporates a friction-fit sleeve and an internal semi-O-ring seal, creating a tight barrier that protects the objective lens on centerfire and rimfire rifles without adding significant bulk.

Key Features

Specialised Oval Geometry: Custom-moulded to seal non-circular TV-view scope bells measuring 39.10 mm × 34.00 mm (1.54" × 1.34").
Friction Collar with Semi-O-Ring: Delivers a tight, water- and dust-resistant fit over outer scope bell tolerances ranging from -0.25 mm (-0.010") to +0.64 mm (+0.025").
Silent Spring Deployment: Uses a stainless steel spring mechanism and dual-sided release tabs for rapid, near-silent opening when tracking game.
Cold-Weather Tested: Rated by the manufacturer for reliable mechanical operation in temperatures down to -40°C (-40°F).
Ultra-Lightweight Build: Adds less than 28.35 g (< 1 oz) to the firearm, preserving balance across standard rifle and shotgun calibres.

Product Specifications

Model Number: BC30110 / 30110
Fit Profile: Size 11 Oval / TV-View Objective
Target Bell Dimensions: 39.10 mm × 34.00 mm (1.54" × 1.34")
Fit Tolerance Range: -0.25 mm to +0.64 mm (-0.010" to +0.025")
Usable Bell Dimension Range: 38.85 mm × 33.75 mm to 39.74 mm × 34.64 mm
Weight: Less than 28.35 g (< 1 oz)
Material: Matte black polymer with stainless steel spring hinge
Minimum Operating Temperature: -40°C (-40°F)

Who is the Butler Creek Flip Open 11 Objective - Oval Shape for?

Hunters using classic Redfield Widefield scopes — secures non-circular objective bells measuring 39.10 mm × 34.00 mm (1.54" × 1.34") with a dedicated oval rifle scope cover that provides an airtight, dust-proof friction seal.
Shooters operating wide-field TV-style hunting scopes in harsh conditions — adds less than 28.35 g (< 1 oz) of weight while functioning reliably down to -40°C (-40°F) to keep mud and rain off specialized oval optics in rough terrain.

Less suitable for: Rifle scopes with outer bell dimensions exceeding 39.74 mm × 34.64 mm, bell dimensions under 38.85 mm × 33.75 mm, or standard circular lenses; these configurations require a round flip-open scope cap or a multi-flex universal stretch cover.

SKU	BCK39880LP
Model #	BC30110
Brand	Butler Creek
Shipping Weight	0.2000kg

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Butler Creek Bc30110 Flip Open Scope Cover Size 11 Oval

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