After more than 6 decades of life, several eye surgeries, and trifocal glasses, I'd pretty much given up trying to hit the side of a barn with open sights. Everything I had (except for shotguns) was wearing an optical sight. Then I bought a K-31 a couple years ago. Loved that straight pull bolt action. I took it to the range with the open sights and was not able to get better than a 6 inch group at 25 yards. Just could not see the sights well enough. So back it went into the safe. Recently, I decided I had to do something with it, either mount a scope so I could shoot it or sell it. Not wanting to put a scope on it, I tried getting a set of the mojo sights. On the K-31 you have in essence a peep sight halfway along the gun with another aperture on the end of the barrel. Center one circle in the other circle with the target in the center of everything. I still can't focus that well but well enough with this arrangement that I put them into one large hole at 25 yards. On the target at 100 yards, #1 was the first shot. I then drifted the front sight over to adjust the windage and fired 5 shots into 1 1/2 inches! I gave the front sight a little tap back and fired #3 to check windage which is about as good as I need to get. I had to put 5 of the 1" circles on the target since I couldn't really make out just one at 100 yards. So, if you think you can't shoot anything but a scope, try out these mojo aperture sights. There may still be some good iron sight shooting in you yet. Not exactly traditional open sights but not a scope either.