Butler Creek 21920 Multiflex Flip-Open Scope Cover Eyepiece, 19-20


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  • Flip-open scope covers
  • Protects in the most extreme conditions
  • An airtight semi-O-ring keeps out dust and moisture
  • Please watch related video for instruction on sizing


Butler Creek

Product Code:



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Product Description

Butler Creek's Flip-open scope covers are custom fit to your specific scope for maximum protection. Quiet opening lids flip open at the touch of your thumb and are virtually silent. The button that opens the scope cover is ergonomically designed so that even the slightest pressure applied will open the flap, allowing you to keep your eye on the target without fumbling to open the scope cover. Water-tight friction mounts anchor the covers to your scope while an airtight semi-O-ring keeps out dust and moisture that can damage and cloud your scope.

From the Manufacturer

Simply the ultimate scope lens protection for hunters and shooters with additional flex in the collars to fit a wider range of scopes. They're create a watertight, airtight seal, and open with a touch of your thumb, so you can put your shot through the narrow window of opportunity in the most extreme conditions.

Product details
  • Product Dimensions: 2.8 x 3 x 5.8 inches
  • Shipping Weight: 0.8 ounces (View shipping rates and policies)
  • ASIN: B00162JHJG
  • California residents: Click here for Proposition 65 warning.
  • Item model number: 21920

This is an honest review of this item, which I purchased full price on Amazon.com:

I was looking for an affordable and quick opening replacement cover for my hunting rifle. I have always heard that the Butler Creek covers are the only way to go, now I'm a believer!

I will never again settle for the covers that come with some optics, they are obviously worthless. These covers seem to be built well and open EXTREMELY quick! They wont keep the water out but they will keep your glass from getting scratched up!

Make sure you get the right size, its extremely important! If any issues come up with mine over the hunting season and in the future I will update this review.

If you want the best optic cover in the biz...buy Butler Creek!

This will fit the ocular lens on the EFR scopes. I say "scope" because there has been a change somewhere along the line. One has metal turret covers and the other plastic. The ocular on the plastic capped scope is slightly smaller in dia. than the other one. It still fits fine - an goes on easier. The optics and clicks are identical on these scopes. I have three right now.

Butler Creek 21920 Multiflex Flip-Open Scope Cover Eyepiece, 19-20

Use this for the objective lens: #30 1.960"

I bought this size scope cover because Primary Arms recommended it. However, a size 16 fits my 4-14-44 PA scope much better than this one. This one appears to be too loose & will rotate up & down when you depress the yellow latch button. My smaller “16” Butler Creek w/ Red Button just looks better & fits much tighter. I originally had that size 16 on my 1x6 ACSS Reticle Scope. This one is just sitting in closet as a spare

Does its job very well. I just wish that there was a way to figure out like on a chart for each specific scope which size to get. I had to waste a couple of hours trying to figure it out. You can download and print out the sizing diagrams but that still takes time and estimation and uncertainty if you did it right. I've bought wrong ones before for my other scope and had to order again the right one and sell the wrong one - way too much trouble!

Whoever are selling these, please compile a chart for the most common scopes and build from there. It'll save buyers a lot of time and guesswork. I'll start. I bought size 19-20 for the Eyepiece of my Nikon P-223 4-12 X 40MM Scope - BDC600

Good snug fit to my scope and works well. Holding back one star to see how well it holds up to this hunting season. Last one didn't make it.

Been using Butler Creek lens cap on all my scopes for years. Tight fit and they keep the lenses clean and dry. Measure the object and eye of the scope with a pair of calipers. Then match the measurement with the cap size on the chart and you will have a prefect fit.

Works great. Fits the objective side of the scope on my Bushnell 2x7 32mm AR scope for my Ruger 10/22. The size 13-15 fits well on the Multiflex objective side. I went with a Multiplex flip-open size 19-20 for the eyepiece side. Keep in mind that the Objective side does not have a yellow lever to open. That is the eyepiece side. Make sure you order the right side and size. The objective side just flips up without a yellow lever.

Maybe I had a rare positive experience but, honestly all of my Butler Creek caps have fit perfectly. Granted, I do measure the scope personally before I order. Have purchased four caps now, both the standards for a prism optic and these multiflex for an old BSA Radiant scope that came with a bolt action I bought and that I could not find any information about. Both pairs of Butler Creeks have fit flawlessly, no falling off or caps staying open. Everything works as advertised with my units. Very nice.

super. Le jaune est en caoutchouc (et le rouge en plastique) Le jaune est le meilleur. parfait sur mon bushnell Trophy xlt 3-9x40

The scope caps are great, getting sizing right can be trick . Have had to return some caps that didn't fit right contrary to sizing charts and measurements.

The button novelty is pretty cool. However, in actual practice these covers open up on their own all the time.

Measure twice install once.. this fit perfectly and has a nice quick snap open.

As expected. Fits perfect. Works great. Actually very quiet to.

Fits great. Opens and closes smoothly.

Fits a wider range of scope diameters than the originals. I would never hunt without them. Not silent opening but quiet enough. A quality product that will last a lifetime.

Measure your scope. You can’t go wrong with Butler Creek

Great product. Great price

Although more flexible they still need taped to the scope.

Works okay