@MujtabaYousuf are you following a Tim Bergholz AK-47 tute?...if so, then not only is that specific low poly region triangulated wrong but also as poopipe had mentioned, smoothing group, as well.
hey guys. How are you all? Well I am modeling a stock for my ak-47 and a weird shading problem appeared. Here are the snapshots. 1- This is how it looks after applying smoothing groups. 2- This is the wireframe. 3-) This is what it looks like after applying turbo smooth.