Here's the deal...I'm shooting my Glock 34 with Sevigny sights. I shoot well, but I feel like my sight picture is all over the place. I can call my shots just fine, so that's not the problem. The problem is, my groups are larger than they should be. I have great trigger control. The rear sight notch is too big, at least I think. When I shoot my front sight floats in that huge notch. I feel if I had a smaller notch, such as on the Dawson Precision Adjustable that fiber rod would fit a little tighter and give me a more accurate shot placement. Does anyone know the dimension of the rear sight notch for the DP? I emailed DP and haven't gotten an answer yet. I am planning on the 0.285 tall front blade which is 0.100 wide with a 0.040 rod. Any opinions from the DP users?