Front Aperture Modification

dlinden · Post by **dlinden** » Mon Sep 23, 2013 6:10 pm

Anyone with experience in cutting off the side bars on an adjustable front iris? The size I want doesn't come in a circle only configuration.

http://www.champchoice.com/SearchResult ... Words=9801

Thanks - Dennis

Tim S · Post by **Tim S** » Tue Sep 24, 2013 3:23 am

Is the iris set into glass? On some irises, the side bars are what holds up the iris.

redschietti · Post by **redschietti** » Wed Sep 25, 2013 3:11 pm

and in some, they are easily removed...ask the seller

Thedrifter · Post by **Thedrifter** » Wed Sep 25, 2013 4:00 pm

goodness what length barrel and tube are you running to need a 5 to 7mm front apterture?

Gehman makes a 3-5mm that i use on my 26+8" configuration...

Tim S · Post by **Tim S** » Wed Sep 25, 2013 4:24 pm

He may have an eagle eye. Alternatively, just a large element. Back when I shot with a 12in tube on a 27in barrel I had a 5.7mm element. It;s now 26 = 6 with a 4.8mm.

dlinden · Post by **dlinden** » Wed Sep 25, 2013 8:02 pm

I have a 27" barrel and want to try a tuner/extension tube, but I am also using a plus diopter in the front sight. With that sight radius, you need an aperture greater than 6.0. I don't write the laws of physics, just follow them.

Learned today that Gehmann is now selling a larger adjustable diopter that doesn't have the side bars. It is just a circle.

Dennis L

mobarron · Post by **mobarron** » Mon Oct 21, 2013 6:08 pm

If you know what size you need, Centra makes fixed apertures mounted in clear plastic for 18mm and 22mm. Less expensive than the variable and they don't break. Mike barron