I think those are the same I have- made by Eagle, and called the Zephyr. They obviously helped my accuracy with the rifle, but they are a little cheap. The rear peep extends above the protective ears and is pretty vulnerable to catching on things and getting banged up. The windage adjustment is a horzontal screw with a piece of spring steel rubbing up against it to keep it from turning. They increase the sight radius, but at the expense of sticking up above the barrel/receiver quite a bit, and there is a lot of plasic involved. I heard after buying them that you can modify the sight from an M1 carbine to fit. I'm sure this would be a superior sight, but I don't know how much work this would be. Overall, probably worth the $30 I paid, but I'm waiting for them to catch on something and break, at which point I'll look for something more durable.