The blue circle seems like they don't have a lot of polygons, but the edge loop goes all around your pistol. It's alot of extra geometry you dont need. So you can keep the blue circle part, but you need to end the edge loops just ourside that shape *IN A FLAT AREA*. If you don't end edge loops in flat area, you get smooth…
Sorry for the quality, i am in a crappy laptop with no mouse and i only have MS paint. From a technical point, you have many errors in the way you build your model. 1) your main part is only 1 piece, so when you want to bevel edges, the edge loop goes ALL AROUND the model = extra geometry.All the green lines i made, show…