Actually I purchased a pair of PTS sights for $20.00 new. I was pretty amazed at how nice they look and solid they felt out of the box. I originally was going to mount them on my kid's nerf gun. It didn't fit, and would require some time with a dremel. So i threw it on a rail, din't like what I saw. Firstly, you can wiggle it around. bleh. Secondly, when you the nut spins when you tighten the bolt to secure the sight. I think if maybe they used the correct size nut it would alleviate the problem but meh. Thirdly, it doesn't fit flat on the rail when in the down position. Lastly and most importantly, I can make adjustments to it just by using my fingers. This thing isn't gonna hold zero. Didn't even bother to put it on my 5 year old's nerf rifle.