The Butler Creek Element Flip Open Eyepiece 1 37-42mm (MPN: BCEEP1) is a rugged, passive rifle scope accessory engineered to shield ocular lenses from fine dust, mud, abrasion, and moisture. Constructed with a flexible multi-flex rubber sleeve, a durable polymer lid, and stainless steel hardware, it provides a secure friction fit over ocular bells measuring 37 mm to 42 mm (1.46 in to 1.65 in) in outside diameter. It features an interchangeable modular disk system and a dual-position hinge that locks into place to maintain unobstructed sightlines during field carry and shooting.

Key Features

• Modular Disk System: Includes three swappable inserts: an opaque black disk for glare and lens protection, a clear lens disk for rapid reticle viewing in wet conditions, and a ballistic data disk that holds printable drop charts.
• Dual-Position Hinge: Folds open and locks firmly at either 180 degrees upright or 270 degrees flat against the scope tube to prevent interference with turret access and sight picture.
• Multi-Flex Rubber Sleeve: Stretches over varied ocular bell profiles within a 37 mm to 42 mm outside diameter range to create a tight, weather-resistant friction seal.
• Recoil-Resistant Build: Utilises heavy-duty polymer and stainless steel pins engineered to withstand the recoil forces of all centerfire, rimfire, and airgun calibres.
• Non-Electronic Operation: Requires no batteries or wiring, functioning as a lightweight mechanical accessory with a packaged shipping weight of approximately 100 g to 125 g (0.22 lb to 0.27 lb).

Specifications

• Brand: Butler Creek
• Model / MPN: BCEEP1 (Element Eyepiece #1)
• Fitment Compatibility: Eyepieces with outside diameters from 37 mm to 42 mm (1.46 in to 1.65 in)
• Open Positions: 180 degrees and 270 degrees
• Materials: Polymer lid, stretch rubber sleeve, stainless steel hinge hardware
• Packaged Weight: Approximately 100 g to 125 g (0.22 lb to 0.27 lb)
• Calibre Suitability: Universal (airgun, rimfire, centerfire)

Who is the Butler Creek Element Flip Open Eyepiece 1 37-42mm for?

• Feral pest hunters operating in dusty or wet environments — needs a flip open scope eyepiece cover with a multi-flex sleeve that fits ocular diameters between 37 mm and 42 mm (1.46 in to 1.65 in) to seal fine dust and water away from internal ocular glass during mobile stalking.
• Long-range precision target shooters utilizing ballistic drop data — requires an eyepiece cover featuring an integrated ballistic data disk along with a 270 degrees folding hinge to display elevation charts directly behind the ocular while clearing the line of sight above the optic.

Less suitable for: Rifle scopes with an ocular bell outside diameter below 37 mm (which causes the sleeve to fit too loosely) or above 42 mm (which risks tearing the collar), requiring instead a smaller or larger sized scope eyepiece cover, as well as forward objective lenses that require dedicated objective-diameter flip caps.