My vortex viper has a 44mm objective lense, but the outer diameter is actually 51mm. Should I go with the 49-54mm?

Yes, the sizes are based on the overall external diameter of the bell.

What is the difference between the eyepiece and objective covers? They appear to be the same.

I bought both the objective lens and eyepiece in 37-42mm size. They are identical. not sure why they are sold as two separate items.

My Diamondback eye piece is a 43mm outside diameter so which would be the best to go with?

I would get the 43mm as you would probably rip the rubber part of the covers if you’re trying to fit it over the top of your scope that’s larger. People have complained about the rubber ripping and it’s most likely because they bought a size too small. To be 100% sure, I would start with the 43mm caps and then when you get them try it on your scope and see how it fits and if it’s not to your liking then return it and order the next size up or down.

In the size selection dropdown whats the difference between eyepeice and objective 43-48mm. are they the same thing?

Eyepiece is exactly what it says , it’s the lense closest to your eye , normally the smaller of the two lenses of a rifle scope , or spotting scope or binoculars . And the objective lense is usually the larger forward lens. Hope this helped PS- I thought these flip up lens were a good deal I will see how they hold up after more years of use .

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Monstrum Rubberized Flip-Up Rifle Scope Lens Covers

Product ID: 52239173

Details

Brand
Monstrum
Color
Black
Compatible Devices
Rifle
Item Weight
0.02 kg
Material
Rubber and
Mounting Type
Picatinny

🎯Precision fit by outside diameter

🔄Spring-loaded flip-up ease

🛡️Rubberized abrasion & dust protection

COP 69828

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In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Lock in clarity, flip up fast, and never miss your shot!

TRUSTED BY PROS - Top 5 in Sporting Optics Covers with 4.3-star rating from 6,800+ users.
SLEEK MODERN STYLE - Matte black finish blends seamlessly with your tactical gear.
CUSTOM PRECISION FIT - Measure outside diameter, not lens size, for flawless compatibility.
DURABLE RUBBERIZED SHIELD - Protects your scope lenses from dust, scratches, and abrasion.
EFFORTLESS FLIP UP DESIGN - Spring-loaded mechanism pops open instantly when you need it.

Monstrum Rubberized Flip-Up Rifle Scope Lens Covers offer a precision fit based on the outside diameter of your scope housing, ensuring secure protection. Featuring a spring-loaded flip-up mechanism, these covers provide quick access while shielding your lenses from dust and abrasion with durable rubberized material. Popular among hunters and tactical users, they combine modern style with reliable performance.

Specifications

ASIN	B07667F5YX
Best Sellers Rank	#1,000 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Sporting Optics Covers
Brand Name	Monstrum
Color	Black
Compatible Devices	Rifle
Customer Reviews	4.3 4.3 out of 5 stars (6,896)
Item Weight	0.02 kg
Manufacturer	Monstrum
Manufacturer Part Number	FCO-C
Material Type	Rubber and Polymer
Mounting Type	Picatinny Mount
Number of Items	1
Number of Packs	1
Objective Lens Diameter	40 millimeters
Product Style	Modern
Sport Type	Hunting
UPC	704715311696
Unit Count	1 Count

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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COP 69828

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Colombia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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