How do I ensure the Size 51 (Model BC30510) objective cover will fit my rifle scope?

The Size 51 cover is specifically precision-engineered for scope objective bells measuring 65.4 mm (2.575 inches) in outside diameter. It accommodates a tight friction fit for bells ranging from 65.15 mm to 66.04 mm. You should accurately measure your scope's objective bell with calipers before purchasing to ensure it falls within this exact tolerance.

Will this flip-open cover hold up against extreme Australian outback heat and freezing alpine conditions?

Yes, the durable polymer construction is cold-weather tested down to -40°F (-40°C) and is formulated to resist heat-induced deformation under normal field conditions. This makes it highly reliable whether you are traversing dusty, sun-baked outback terrain or dealing with wet, freezing conditions in the Snowy Mountains.

Are there any clearance issues I need to check on my rifle before installing this cover?

Yes, you need to ensure there is adequate clearance between the bottom of your scope objective bell and your rifle barrel to accommodate the thickness of the slip-on collar. If your scope is mounted using ultra-low rings with zero barrel clearance, this cover will not fit, and you may need to consider an alternative option like a bikini-style cover.

Does this cover require any electrical compliance markings or special tools for setup?

No electrical compliance or SAA/RCM certifications are required because the BC30510 is a purely passive, non-electronic mechanical accessory. Installation requires no special tools; simply stretch the flexible polymer collar directly onto your properly measured scope objective bell for a secure friction fit.

Scope Cover Size 51 - Butler Creek BC30510

The Butler Creek Flip-Open Objective Scope Cover (Size 51 / Model BC30510) provides airtight, watertight objective lens protection with rapid, silent deployment. Engineered with a flexible polymer collar and a rigid lid, it seals out fine bull-dust, rain, mud, and snow in demanding field environments. An integrated silent-action spring hinge snaps open instantly via ambidextrous thumb tabs, allowing shooters to acquire a target sight picture without manual cap removal or game-spooking noise.

Key Features

Spring-Loaded Mechanism: Features an integrated silent spring hinge that instantly flips the cap open with a light press of the thumb tab.
Environmental Protection: Features an internal semi-O-ring friction-mount seal that creates an airtight and watertight barrier against moisture and dust.
Ambidextrous Design: Built with dual opening tabs accessible from either side for left- and right-handed shooters.
Cold-Weather Durability: Tested to operate reliably down to -40°C (-40°F) without cracking or failing.

Specifications

Nominal Bell Diameter: 65.4 mm (2.575 inches)
Usable Fit Envelope: 65.15 mm to 66.04 mm
Weight: Less than 1 oz (< 28.3 g)
Minimum Operating Temperature: -40°C (-40°F)
Material: Flexible and rigid matte black polymer
Power Requirements: Non-powered / purely mechanical
Model / MPN: BC30510 / 30510

Who is the Butler Creek Flip Open 51 Objective for?

Hunters and marksmen operating large-objective rifle scopes in harsh environments — rely on this flip-open scope cover's internal semi-O-ring friction seal and cold-weather resistance down to -40°C (-40°F) to safeguard optics from dust, mud, and rain without adding unnecessary bulk, weighing less than 1 oz (< 28.3 g).
Target shooters requiring immediate target acquisition — utilise the silent-action spring deployment mechanism sized precisely for 65.4 mm (2.575 inches) outer objective bells to transition from sealed lens protection to full optical clarity in a single touch.

Less suitable for: Rifle scope objective bells measuring outside the 65.15 mm to 66.04 mm diameter range (which require an alternate size cover) or setups with zero clearance between the objective bell and the barrel on ultra-low rings, which require bikini-style elastic lens covers or screw-in metal caps.

SKU	BCK39884LP
Model #	BC30510
Brand	Butler Creek
Shipping Weight	0.2000kg

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Butler Creek Bc30510 Scope Cover Objective 51 65.4mm

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