Foresight Tunnel Size

GaryD · Post by **GaryD** » Fri Nov 11, 2011 4:55 am

A quick question.

What size foresight tunnels do most people use on their 12" extension tubes 18 or 22mm and why if possible.

Jason · Post by **Jason** » Fri Nov 11, 2011 9:56 am

I switched to a 22 mm front tunnel when I started using a 10" tube on my 27" barrel. I found it easier to keep the front sights centered because the 22 mm tunnel was just that much larger. I also found it easier to focus on the front element with the larger tunnel, but your experience may vary.

Jason

mobarron · Post by **mobarron** » Tue Nov 22, 2011 5:19 pm

Advantages of the 22mm and 30mm: they give the shooter a better view of the number boards (in L/R highpower); they are easier to use with a front magnifying lens because the variable front irises can be opened up to a larger diameter, 3) they may be easier to center in the rear aperture. Disadvantages: blow around more in the wind; no individual apertures; variable irises do not give as clean an aperture.

GaryD · Post by **GaryD** » Wed Nov 23, 2011 4:39 pm

I have just received my 22mm Barry Neasom turnover sight but have yet to try it out, as I am waiting for some 22mm foresight elements in various sizes to arrive.
Hopefully I will find out what size I like and then I will order a Centra High End one.

Bob3700 · Post by **Bob3700** » Wed Nov 23, 2011 7:53 pm

Mike,

I don't remember, do you use a bloop tube on your smallbore rifle? If so, what diameter front sight do you use, 22mm or 30mm?

Recently I installed a 12 inch bloop tube with a 30mm Ritesite on the Anschutz. Man, that is a pretty good sight picture. I do have to open the front iris up all the way to 7.5mm with the .5 diopter though.

Bob Beckett