[Duncans] Flip Up Scope Covers (ALL SIZES AVAILABLE - SELECT)

Duncans Flip Up Scope Covers (or the widely available generic equivalents matching your description) are affordable, spring-loaded flip-up lens caps designed to protect rifle scope objectives and eyepieces from dust, dirt, moisture, scratches, and debris.

They are popular budget/tactical options. We offer all sizes from 25.5 mm to 69 mm—lets them fit a huge range of scopes by matching the outer diameter of the scope tube or bell housing.

 

Key Features and Design

Spring-loaded flip mechanism: A quick press or flip opens the cover upward (or to the side), where it stays open via the spring or a detent. It snaps shut securely when closed. This allows fast, one-handed access without removing the cover entirely.

Materials: Made of durable rubber and plastic for a snug, non-marring fit on the scope finish, with a metal spring hinge. These offer a perfect balance of rigidity and flexibility to ensure a long lasting fit.

Sizes and fit: Covers come individually (you typically buy separate ones for objective and eyepiece). The wide range (25.5–69 mm) covers most common rifle scopes, airsoft optics, crossbows, etc. Measure the outside diameter of your scope’s objective bell or eyepiece housing (not the glass/lens diameter itself) with calipers for the best fit. If between sizes, many users go slightly larger for easier installation.

Protection level: Good against dust, debris, and light rain. They are not always fully submersible or as rugged as premium options.

Other traits: Lightweight, low-profile when closed, and black. Installation is tool-free—just slide over the end.

 

Pros

1. Very affordable (often $5–15 per cover).
2. Fast deployment—much quicker than screw-on or bikini-style caps.
3. Stay attached to the scope so you won’t lose them.
4. Wide size availability makes them versatile for many optics.
5. Simple and effective for hunting, range use, or tactical applications.

 

Cons

1. Fit is critical—poor measurement leads to loose or overly tight covers. (we can help in-store)
2. Usually sold singly, so a full set (objective + eyepiece) requires two purchases.
3. Limited weather sealing compared to some dedicated systems.

 

Tips for Use

1. Accurately measure your scope’s outer diameter at the mounting point.
2. Install carefully to avoid damaging the scope finish.
3. Test the flip action and seal before heading into the field.
4. For best results on variable scopes or specific models, check compatibility or user reviews for that exact optic.

 

They’re a solid, cost-effective choice for most shooters who want quick lens protection without spending a lot.