14 Best Flip Up Scope Covers of 2026 For a Snug Fit

1

Leupold Alumina Flip Back Lens Cover Kit - 40mm &

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.4
• Brand
  Leupold

Key specs2

Optic Mounting Interface

Threaded Alumina fit

Optical Protection

Precision threaded aluminum covers shield the 40mm objective and standard eyepiece lenses from rain, dust, and direct debris without sliding loose under heavy recoil.

Pros & cons32

Pros

• Includes dedicated covers for both the 40mm objective and standard eyepiece
• Screw-in Alumina construction secures directly into compatible scope threads
• Low-profile flip-back design avoids bulky slip-on sleeves over the optic body

Cons

• Requires compatible Leupold scope threading rather than standard friction slip-on fit
• Does not fit riflescopes lacking Leupold Alumina compatible internal threads

2

Vortex Optics Defender Riflescope Flip Cap - Eyepiece (E-10) &

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.2
• Brand
  Vortex

Key specs2

Included Components

• Ocular eyepiece cap (E-10)
• Objective lens cap (O-50)

Scope Bell Compatibility

Designed to slide over compatible Vortex and standard riflescopes requiring an E-10 ocular size and a 50mm class objective bell.

Pros & cons32

Pros

• Provides a paired set covering both the ocular eyepiece and 50mm objective bell
• Flexible collar accommodates minor diameter variances for a firm slip-on hold
• Multi-position spring hinge locks upright or lays flat against the scope tube

Cons

• Objective cover requires verifying exact 50mm bell outer diameter compatibility
• Collar adds slight external bulk around ocular and objective bells

3

Monstrum Pro Series Flip-Up Scope Lens Covers (Objective Bell |

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.2
• Brand
  Monstrum

Key specs2

Objective Bell Fit Range

55-62 mm outside diameter

Sizing Requirement

Requires verifying the outside bell diameter with calipers rather than relying on nominal objective glass size before installation.

Pros & cons32

Pros

• Accommodates wide objective scope bells spanning 55 mm to 62 mm outside diameter
• Pro Series build provides rigid spring-assisted snap opening when actuated
• Rubberized sleeve flexes over the objective housing to seal against weather

Cons

• Single objective cover only, requiring separate purchase for eyepiece protection
• Will slip off bells measuring narrower than 55 mm outside diameter

4

Vortex Optics Defender Riflescope Flip Cap - Eyepiece (E-10)

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.1
• Brand
  Vortex

Key specs2

Cap Placement

Ocular eyepiece

Eyepiece Retention

The flexible rubber sleeve stretches over the fast-focus ocular bell to provide a tight friction fit without marring the finish.

Pros & cons32

Pros

• Dedicated ocular cap engineered for standard riflescope eyepiece housings
• Spring hinge features multiple stop positions to keep cap out of the sight picture
• Durable polymer build resists cracking in cold or rough field conditions

Cons

• Covers ocular eyepiece only, objective cover sold separately
• Eyepieces larger or smaller than E-10 specification prevent secure mounting

5

Monstrum Ultra Series Flip-Up Scope Lens Covers (Eyepiece | 43-48

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.3
• Brand
  Monstrum

Key specs2

Eyepiece Diameter Range

43-48 mm

Housing Protection

Slides over the scope ocular end to safeguard optical coatings from precipitation and thumb grease while maintaining rapid access to your reticle.

Pros & cons32

Pros

• Sized specifically for riflescope eyepieces measuring 43 mm to 48 mm diameter
• Ultra Series frame offers lightweight lens defense against moisture and brush
• Quick-flip latch opens smoothly without requiring excessive thumb pressure

Cons

• Only covers the eyepiece and leaves the objective bell unprotected
• Requires exact ocular measurement to prevent loose spinning on the housing

6

Monstrum Rubberized Flip-Up Rifle Scope Lens Covers (Objective Bell |

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.8
• Brand
  Monstrum

Key specs2

Objective Bell Range

49-54 mm outside diameter

Weather Protection

Rubberized collar conforms tightly to the outer housing, blocking water droplets and dust from creeping past the objective seal.

Pros & cons32

Pros

• Flexible rubberized sleeve stretches securely across 49 mm to 54 mm objective bells
• Forms a tight friction seal to prevent trail grit and rainwater from reaching glass
• Spring-loaded flip cap stays back out of view until snapped shut

Cons

• Objective bell cap only with no ocular lens cover included in package
• Rubber sleeve can stretch over time if mounted on bells exceeding 54 mm

7

Monstrum Pro Series Flip-Up Scope Lens Covers (Objective Bell |

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.4
• Brand
  Monstrum

Key specs2

Outer Bell Fit

49-54 mm

Pro Series Construction

Built with rugged polymer hinges and a reinforced snap latch designed to prevent unintended openings when moving through dense brush.

Pros & cons32

Pros

• Engineered for 49 mm to 54 mm objective bells with durable Pro Series materials
• Snappy spring-loaded flip mechanism deploys instantly with a finger flick
• Tight polymer collar stays in place during field carry through dense brush

Cons

• Does not include an eyepiece cover for total optic encapsulation
• Outside bell diameter must be checked with calipers to confirm fit

8

Butler Creek 27 Objective Flip Open Scope Cover

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.5
• Brand
  Butler Creek

Key specs2

Model Specification

Butler Creek Size 27 Objective

Objective Deployment

Silent spring mechanism flips the protective cover completely clear of the objective field of view for uninterrupted sight acquisition.

Pros & cons32

Pros

• Classic Butler Creek flip-open design creates a rapid water-resistant lens barrier
• Instant-action lid springs open clear of the sight path with a quiet tap
• Lightweight construction adds minimal bulk to the front of the riflescope

Cons

• Size 27 objective fits a narrow specific bell diameter rather than a broad range
• Rigid plastic sleeve offers less elasticity than rubberized multi-size sleeves

9

Vortex Optics Defender Riflescope Flip Cap - 50mm Objective Lens

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Vortex

Key specs2

Objective Model

Vortex Defender O-50

Multi-Position Hinge

Locks open in multiple positions, including flat back against the tube, preventing the cap from obstructing elevation turrets or target sight lines.

Pros & cons32

Pros

• Tailored specifically for 50mm objective scope bells using the O-50 footprint
• Multi-angle cap positions allow setting the lid flat or at 45 or 90 degrees
• Rugged rubber sleeve holds firm under harsh field conditions and heavy recoil

Cons

• Covers the front objective only and requires pairing with an ocular cap
• Requires checking actual bell outer diameter against Vortex O-50 sizing specs

10

Vortex Optics Defender Riflescope Flip Cap - Eyepiece (E-10) &

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.7
• Brand
  Vortex

Key specs2

Included Cap Pair

• Ocular cap model E-10
• Objective cap model O-44

Optic Coverage

Protects both ocular and objective glass surfaces simultaneously, creating a unified barrier against field moisture and dust.

Pros & cons32

Pros

• Complete front and rear protection bundle for 44mm scopes using E-10 ocular size
• Defender spring caps fold flat against the optic tube to preserve turret visibility
• Durable rubberized sleeve grips scope housing tightly without slipping in wet weather

Cons

• O-44 objective cap does not fit larger 50mm or smaller 40mm scope bells
• Dual caps add minor weight compared to ultra-minimalist bikini style covers

11

Monstrum Rubberized Flip-Up Rifle Scope Lens Covers (Eyepiece | 37-42

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.0
• Brand
  Monstrum

Key specs2

Eyepiece Sizing Range

37-42 mm (1.5-1.7 in)

Ocular Lens Shield

Guards ocular coatings against fingerprints, rain, and grit, flipping out of the eye line quickly when mounting the rifle.

Pros & cons32

Pros

• Fits compact and standard scope eyepieces measuring 37 mm to 42 mm diameter
• Flexible rubber sleeve provides friction retention on slim ocular housings
• Spring-assisted flip lid snaps closed tightly to guard glass against scratching

Cons

• Does not fit ocular bells exceeding 42 mm (1.7 inches) in diameter
• Covers ocular end only and requires matching front cover for full protection

12

Monstrum Pro Series Flip-Up Scope Lens Covers (Eyepiece | 43-48

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.9
• Brand
  Monstrum

Key specs2

Eyepiece Diameter

43-48 mm

Pro Series Hinge

Reinforced hinge design prevents cap wobble and maintains tension, ensuring the ocular cover stays locked shut during transport.

Pros & cons32

Pros

• Engineered to fit 43 mm to 48 mm ocular eyepiece housings with a snug grip
• Pro Series reinforced hinge resists accidental snapping during active field movement
• Tactile flip tab allows positive one-touch cap opening with gloved hands

Cons

• Protects eyepiece only, leaving objective bell uncovered
• Will not mount properly on smaller ocular housings under 43 mm

13

Monstrum Rubberized Flip-Up Rifle Scope Lens Covers (Objective Bell |

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.3
• Brand
  Monstrum

Key specs2

Compact Objective Range

37-42 mm (1.5-1.7 in)

Bell Fitment

Sized specifically for slim objective bells found on lower-magnification and compact rimfire or hunting scopes.

Pros & cons32

Pros

• Designed for compact objective bells measuring 37 mm to 42 mm outside diameter
• Elastic rubberized sleeve stretches over scope bell for a weather-tight fit
• Flip-up cover snaps securely shut to shield objective glass from mud and water

Cons

• Cannot be used on full-size 44mm or 50mm objective scope bells
• Package contains objective cap only and excludes ocular eyepiece cap

14

Monstrum Rubberized Flip-Up Rifle Scope Lens Covers (Eyepiece | 43-48

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.0
• Brand
  Monstrum

Key specs2

Ocular Diameter Span

43-48 mm (1.7-1.9 in)

Rubber Sleeve Retention

Flexible rubber sleeve stretches over fast-focus eyepieces to provide non-slip friction grip without scratching metal tube finishes.

Pros & cons32

Pros

• Elastic rubberized body accommodates 43 mm to 48 mm scope ocular housings
• Creates a snug friction seal that resists sliding off under heavy rifle recoil
• Finger tab allows fast, effortless flipping open when acquiring a target

Cons

• Eyepiece cap only, requiring a companion objective cover for total scope protection
• Must measure ocular bell diameter rather than scope tube size before buying

Last update on 2026-09-28 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Do you measure outside bell diameter or nominal lens size for flip up scope covers?

You must measure the outside bell diameter of your scope housing rather than relying on nominal lens size. Nominal glass ratings like 40mm, 44mm, or 50mm describe the clear glass diameter inside the tube, not the external metal housing. Slip-on covers, such as the Monstrum Rubberized options sized for 37-42 mm or 49-54 mm outside diameters, require an exact fit over the exterior bell to avoid slipping off. Use calipers to measure the external objective and ocular housing in millimeters before selecting your caps.

Are rubber slip-on sleeves better than threaded metal scope covers?

Threaded metal covers provide a rigid, low-profile seal for compatible optics, while flexible slip-on collars fit a broader range of rifle scopes. Threaded options like the Leupold Alumina Flip Back Lens Cover Kit screw directly into the internal threads of a 40mm objective or Standard EP eyepiece, preventing the caps from snagging or pulling off in thick brush. Slip-on models, including the Monstrum Pro Series and Vortex Optics Defender lines, stretch over the outside bell to create friction. If your optic housing lacks matching accessory threads, a snug slip-on sleeve is your best solution.

Which flip up scope caps stay flat against the tube when opened?

Covers with multi-position spring hinges fold back parallel with the optic body to keep your sight picture clear. The Vortex Optics Defender Riflescope Flip Cap line uses hinges engineered to lay flat along the scope tube rather than sticking upright. This low profile prevents the open lids from blocking turret markings, obscuring target transitions, or catching on overhead branches. Confirm that your mounting rings leave enough clearance for the folded cap to rest without hitting your barrel or rail.

Can flip up covers interfere with rifle barrel clearance on low scope mounts?

Yes, slip-on objective covers add external bulk around the housing bell and can touch the barrel when using low mounting rings. A tight gap between the objective bell and the rifle barrel might not leave room for the extra wall thickness of a rubber sleeve. If your rifle setup requires proper barrel clearance, measure the distance between your optic bell and the barrel before purchasing a slip-on cap. Threaded caps seat flush inside the bell threads, avoiding clearance issues entirely.

How do you pick the correct eyepiece cover for scopes with fast-focus rings?

Measure the widest point of the ocular bell, taking into account any rubber ridges or textured knurling on your focus adjustment. Fast-focus eyepieces often flare outward, meaning an ocular cover like the Monstrum Ultra Series 43-48 mm Diameter or Vortex E-10 must stretch over the ring without binding. Ensure the collar grips the eyepiece body securely without locking the focus ring in place or shifting your reticle clarity. Keeping your reticle sharp and your ocular cap secure is essential for lining up accurate holdovers in the field.

What stops flip up scope covers from popping open during a hunt?

Tight friction tabs and firm mechanical latches prevent spring-loaded covers from popping open unexpectedly in heavy cover. Protective designs like the Butler Creek 27 Objective Flip Open Scope Cover and Monstrum Rubberized sleeves seal against moisture and grit until you hit the thumb release tab. Align the hinge so the lid opens directly along the scope tube rather than at an angle, preventing passing brush from catching under the edge.