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Vortex Defender Flip Cap - Eyepiece E-10 (40-46mm)
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$29.99
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SKU: E-10-875874005877
Overview
Built for protecting a riflescope eyepiece without getting in the way, this flip cap is sized for outside diameters from 40 to 46 mm and is intended for use with nearly all Vortex optics. Its three stop positions let you choose how far it opens, including a flat-back position that keeps the cap out of the sightline when the rifle is shouldered. The snap flat spring is designed to hold the cap clear of your view, which is useful at the range or in the field when you want quick access without constant repositioning. It will not fit the 1-inch tube Viper models listed in the product details, so confirming scope compatibility is important before purchase.
Why Hunters Choose the Vortex
Fits Snugly
A 40–46 mm outside diameter
Three Stop
Positions offer flexible cap placement
Snap Flat
Spring helps keep your line
Vortex Riflescopes,
Fit guidance clearly specified for
Made From
Rubber and super strong polymer
Key Features
- Fits eyepiece diameters from 40 to 46 mm.
- Designed for nearly all Vortex Optics riflescopes.
- Snap flat spring helps keep the line of sight unobstructed.
- Three stop positions: vertical, 45 degrees, and 90 degrees flat back.
- Not compatible with 1-inch tube Viper models VPR-M-01BDC, VPR-M-04BDC, and VPR-M-03BDC.
- Made from rubber and super strong polymer.
Best Used For
- Hunters using compatible Vortex riflescopes who want a flip cap that stays out of the sightline.
- Range shooters needing a cap with three stop positions for quick, controlled lens access.
- Users with 40-46 mm outside-diameter optics seeking a snug, model-specific eyepiece fit.
- Hunters who prefer a durable cap design for frequent field and range use.
- Owners of non-1-inch tube Viper models should avoid this cap due to fit exclusions.
Specifications
| Compatibility | Fits nearly all Vortex Optics and all Vortex Riflescopes except the 1-inch tube Viper model VPR-M-01BDC, VPR-M-04BDC, and VPR-M-03BDC |
|---|---|
| Dope Disk Compatibility | Optional accessory |
| Fit | Snug fit |
| Indestructible | Virtually indestructible |
| Line Of Sight Unobstructed | Yes |
| Material | Rubber and super strong polymer |
| Outside Diameter | 40-46 mm | 1.57-1.81 inches |
| Snap Flat Spring | Yes |
| Stop Position 1 | Vertical |
| Stop Position 2 | 45° |
| Stop Position 3 | 90° to lay flat back |
| Stop Positions | 3 |
Pros
- Fits snugly on nearly all Vortex Optics with a 40–46 mm outside diameter range.
- Three stop positions offer flexible cap placement for different shooting setups.
- Snap flat spring helps keep your line of sight unobstructed.
- Designed for Vortex riflescopes, with fit guidance clearly specified for exclusions.
- Made from rubber and super strong polymer for a rugged build.
Considerations & Trade-offs
- Fits only optics with an outside diameter of 40–46 mm, so it is not a universal solution for smaller or larger eyepieces.
- Not compatible with 1-inch tube Viper models VPR-M-01BDC, VPR-M-04BDC, and VPR-M-03BDC.
- The three stop positions are useful, but the cap still adds a moving component that some users may prefer to keep as simple as possible.
- The dope disk mention refers to an optional accessory, so that setup benefit depends on having that accessory on hand.
Suggested Comparisons
- Rifle scope lens caps
- Scope accessories
- Optics protection accessories
- Rifle scope flip-up caps
Suggested Accessories
- Optics lens cover
- Rifle scope accessory
- Dope disk
- Protective cap
Frequently Asked Questions
What optics will the Defender Flip Cap E-10 fit?
It is listed as fitting nearly all Vortex Optics and all Vortex riflescopes except the 1-inch tube Viper models VPR-M-01BDC, VPR-M-04BDC, and VPR-M-03BDC. The stated outside diameter range is 40-46 mm (1.57-1.81 inches).
How does the flip cap stay out of the way when I’m shooting?
The cap uses a snap flat spring and has three stop positions: vertical, 45 degrees, and 90 degrees to lay flat back.
Is this cap compatible with a dope disk?
The product description says the vertical stop position is intended to put your dope disk, sold separately as an optional accessory, right in your face.
What is the cap made from?
The description says it is made from rubber and super strong polymer.
Are there any fit limitations I should know before ordering?
Yes. It will not fit the 1-inch tube Viper models VPR-M-01BDC, VPR-M-04BDC, and VPR-M-03BDC. Outside that exception, the listed fit is for nearly all Vortex Optics within the 40-46 mm outside diameter range.