I see .004 gap as perfect. To me a tight gap is better than a loose gap. I believe an acceptable tolerance is now .004 to .010. Used to be a smaller range between low ad high back in the day. As long as carbon buildup does not cause drag after shooting a few cylinders worth of rounds then you have no worries. Gunsmith can use shims to easily change gap but if yours is at .003 or .004 and you do not get dirt/carbon dragging on cylinder I would not change it. A bigger gap than .010 can cause accuracy and velocity issues. P.s. your picture looks perfect on your gun.