Ok, this is a weird question... But I was just looking at my Glock 20 and noticed it looks different than the rest of my Glocks. The back of the pistol is not flush. This is hard to explain so I took a picture. Does this look right? It shoots great it just looks different. Please excuse the cell phone pic but it was the only camera I had. Also excuse the silly question if it doesn't make any sense. lol Input is greatly appreciated.