Bulter Creek scope cap - choosing the size

[airgunfans]

The objective diameter of my scope is 57.0 mm, should I use Flip-Open 56.4 (#39 ) or 57.2 mm ( #40 )?

Same scenario for the eyepiece which is 43.1 mm, should I use Flip-Open 42.5 ( #17) or 43.2 mm (#18 )?

Thanks in advance. 

 

[Peskådot671]

That's very close sizes. Did you use a caliper and measure it several times? If you get the larger size, you could always use electrical tape around the rim of the objective or eyepiece for a snug fit. If you get the one that's undersized, you could use soapy water to slip it on or a hair dryer or heat gun to warm up the rubber piece. Last alternative if it's a tight fit is to sand the inside of the Butler Creek cap. Me personally, I would go with the larger size. They are very close in diameter. 

 

[starlingassn]

i always go with the smaller size, they stretch enough for a snug fit.

half a millimeter is a pretty small increment,so it shouldnt be tough to get them on.

 

[hollowpoint]

I would go #40 and #18. They are pretty much your exact dimensions since 0.1-0.2 mm isn't really anything when it comes to a rubber cap. When I installed BC caps on my scope, I had a similar situation and chose the undersized cap. As soon as I went to install it, I immediately wished I had went with the larger size (and I was dealing with 0.6 mm difference). As Peskadot explains, there are plenty of ways to make these caps fit if they are under/oversized, but your dimensions are so close that I would consider the "larger" caps as almost perfect size.

 

[airgunfans]

Thanks for all the response. Just found that BC has a type of cover called "Multiflex" . Each size is able to fit a range of scope diameters through some special design. I have not used this kind of cover before. Just wondering if anyone can share some experience ?

 

[Peskådot671]

I don't have any experience with their newer Multi-Flex scope covers. I've always stuck with their standard model and never had any problems with them fitting as long as I measured them with a caliper and ordered the closest size. You could order the newer model and report back to us how they fit for you.

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