Search  for anything...
Monstrum

Monstrum Rubberized Flip-Up Rifle Scope Lens Covers

  • Based on 6,388 reviews
Condition: New
Checking for the best price...
$11.99 Why this price?
Save $17.95 was $29.94

Buy Now, Pay Later

As low as $2 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sep 20 – Sep 21
Order within 20 hours and 41 minutes
Available payment plans shown during checkout

Recently Viewed

Size: Eyepiece | 37-42 mm diameter


Features

  • Rubberized flip-up rifle scope lens covers that conform tightly around your rifle scope tube, protecting your lenses from dust and abrasion
  • IMPORTANT: Sizing is not based on the objective lens size of your scope - a 3-9x40mm scope will not fit with a 40mm sized lens cover. For the correct fitting lens cover, you must physically measure the outside diameter of your scope eyepiece and objective.
  • Each package includes one Rubberized Flip-Up Lens Cover
  • Spring-loaded flip-up mechanism pops open effortlessly when needed and securely tightly when not in use
  • Please refer to sizing chart and sizing video, carefully measuring the OUTSIDE diameter of your scope, to ensure the proper size and fit.

Brand: Monstrum


Color: Black


Style: Tactical


Sport: Hunting


Item Weight: 26.99 g


Material: Rubber, Polymer


Magnification Maximum: 9


Objective Lens Diameter: 40 Millimeters


Compatible Devices: Rifle


Mounting Type: Integral Mount


Brand: ‎Monstrum


Color: ‎Black


Style: ‎Tactical


Sport: ‎Hunting


Item Weight: ‎26.99 g


Material: ‎Rubber, Polymer


Magnification Maximum: ‎9


Objective Lens Diameter: ‎40 Millimeters


Compatible Devices: ‎Rifle


Mounting Type: ‎Integral Mount


Night vision: ‎No


Eye Relief: ‎37 Millimeters


Manufacturer: ‎Monstrum


UPC: ‎704715311672


Item Package Dimensions L x W x H: ‎6.1 x 4.61 x 2.17 inches


Package Weight: ‎0.03 Kilograms


Brand Name: ‎Monstrum


Part Number: ‎FCE-A


Size: ‎Eyepiece | 37-42 mm diameter


Date First Available: December 26, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 20 – Sep 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Its A Tight Fit But Good
Size: Objective Lens | 55-62 mm diameter
At first I thought there will be no way to get this to fit. But after double checking my measurement I was able to get it to fit. Its a tight fit but it fits and works great. Hopefully the rubber will hold up. ..dont forget to go on Monstrums website and register your warranty.
Reviewed in the United States on April 18, 2025 by GEORGE RICHARDSON
    • Great fit
Size: Eyepiece | 43-48 mm diameter
Great fit and looks sturdy. Sits real well on a scope!
Reviewed in the United States on June 12, 2025 by S_L
    • Amazing value with a great secondary use.
Size: Objective Lens | 31-36 mm diameter
This isn’t about scopes, this is about weapon mounted lights. The cover “31-37mm” is a perfect fit for Streamlight Protac HL-X and Hl-X Pro weapon mounted lights. Carbon buildup on your light sucks and so does taking it off to avoid carbon at the range. Being in a bad situation and having your light lens shine when a light hits you would suck even more I’m sure. This will cure both problems! The cap snaps firmly in place and the spring does its job and the cap goes all the way back to a horizontal position. I bought the 31-37mm lens cover. It says the 31-36 but after you add to cart the description shows 31-37mm. There are products made specifically for this application and will cost you around 50bucks for the same solution. This works perfectly and why spend the extra $$$. Many sizes available just measure the end of your light housing not the lens but the whole housing and you can grab the perfect size. Highly Recommend this! ... show more
Reviewed in the United States on January 5, 2024 by Joe
    • Works well
Size: Objective Lens | 43-48 mm diameter
Very good quality for the price. Fits a DNT scope well. Clips closed securely and opens without too much effort. Overall I'm satisfied. I think this is a good choice if Tenebraex doesn't make something for your particular scope. Lost one star lost due to weak spring that squeaks when opening, but it's really not a big deal. ... show more
Reviewed in the United States on March 3, 2025 by AMNorse
    • Excellent lens cap. Fits right & looks great!
Size: Eyepiece | 43-48 mm diameter
Great cap! Fits perfect and protects the glass! What more could a scope want?
Reviewed in the United States on June 3, 2025 by alpha charlie
    • Rubber Fails immediately ,,,splits
Size: Eyepiece | 43-48 mm diameter
Review Image by ShotintheDark ShotintheDark
Review Image by ShotintheDark ShotintheDark
Big Disappointment The rubber literally split in two at the body after 2 weeks on all my scopes with these . They rely on the rubber to securely wrap the scope body to stay on. At first you are lead to believe it's a great snug fit , then all of them split and are worthless NOT a good product .... I had placed the links to these from my Youtube channel endorsing these as great for thermal scopes Mars MT1000 LRF and DNT Thermnite models and now have to retract my endorsement . Duct tape to the rescue ...looks like crap !! ... show more
Reviewed in the United States on June 24, 2025 by ShotintheDark ShotintheDark
    • Scope Flop Up Cover
Size: Objective Lens | 37-42 mm diameter
Was skeptical, but it is working as advertised, thank you very much.
Reviewed in the United States on June 4, 2025 by 23F250crewcab
    • Effective, but with questionable quality
Size: Objective Lens | 37-42 mm diameter
These technically work fine, but they don't leave me with a lot of confidence. I've had these for almost six months to the day on two rifles and the rubber is pretty much done; all four caps are split and warped. I shoot most weekends and my guns live in air conditioning, but these things look like they've been through a few tours in kandahar. That being said, they stay on my scopes just fine and flip open nicely. The lens cover is big enough to hold a small DOPE card. As far as functionality, they're exactly what I was looking for, but I just don't see these things lasting through a year of use. ... show more
Reviewed in the United States on June 19, 2025 by Super Heavy

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...