Some of you have been waiting years for this. It doesn't have back up irons, it doesn't have room for stacked optics. All frills have been sacrificed to get your optic as low as possible, in an insanely light weight package that hugs the contours of your receiver. You wanted it low, you wanted it simple, and we've delivered. No rail sits lower. This thing is 1/10th the weight of it's closest competition!!!! Super strong carbon fiber construction can't rust, can't shift, and doesn't reflect any wavelength of light. It's UV stable, resistant to solvents, and practically indestructible mounted to your PS90. Dimensional tolerances and corrosion resistance exceed MilSpec. All USA labor, fasteners, and materials. Take a good look at the pictures. There are a lot of optics that won't fit on this rail because it sits so low. An Eotech is limited to one rail position, where it nestles into the dip in the receiver. With an Eotech mounted no rail slots are left available. If you like your guns to have clean lines, you can't do better than this!