Butler Creek Flip-Open Eyepiece Scope Cover - 1.341"/34mm MFG 20010 Size 01

The Butler Creek Flip-Open Eyepiece Scope Cover in 1.341"/34mm (MFG 20010 Size 01) is a purpose-built lens protection solution engineered to shield optical glass from dust, moisture, and impact during field operations. This eyepiece scope cover features a flip-open design that enables rapid access without full removal, critical for shooters requiring quick sight picture acquisition during training or deployment. Butler Creek manufactures these scope covers in over 30 size configurations, with each model custom-fitted to create a watertight and airtight seal protecting coated optics from environmental degradation.

The 34mm eyepiece diameter specification matches standard mid-range rifle scope mounting configurations common across AR-platform rifles, bolt-action hunting systems, and tactical carbines. The flip-open mechanism operates via thumb actuation, allowing single-handed deployment without setting the rifle down or removing gloves—essential for cold-weather operations or when maintaining firing position. The watertight construction prevents water intrusion during precipitation, water crossings, or maritime environments, while the airtight seal minimizes internal fogging and condensation that degrades optical clarity. Compact dimensions (2.8 x 1.55 x 4.9 inches) and minimal weight (0.05 lbs) ensure this cover adds negligible bulk to optics packages.

This eyepiece cover suits law enforcement marksmen, military designated riflemen, long-range competitive shooters, and precision hunting applications where lens protection directly impacts mission effectiveness. Operators engaged in extended patrols, high-round-count training cycles, or operations in dusty or wet environments benefit from continuous optical protection without the handling friction of removable objective covers. The flip-open design specifically addresses the operational reality that objective covers are frequently removed and lost, whereas eyepiece covers remain attached because access speed through the eyepiece is non-negotiable during engagements.

Proper scope cover sizing is critical to effectiveness—oversized covers create excessive drag or fail to seal, while undersized covers either don't fit or apply pressure that affects optical alignment. The 34mm Size 01 specification ensures compatibility with scope tubes matching this eyepiece diameter. Butler Creek's modular approach across 30+ sizes reflects the reality that scope specifications vary widely by manufacturer and model year, making size-matched protection essential rather than universal covers that compromise performance.