Barrel gaps are okay between .004 and .012. To me, less is better if the shooter accepts that closer gaps may cause fouling to interfere a little earlier requiring more frequent field stripping and wipe down.
If the shooter is loading with a press, this becomes a non issue because the pistol essentially gets field stripped after six shots.
I wonder if there are MV statistics out there using a pistol assembled with its widest achievable gap and then compared with the same pistol with its tightest gap.
The logic behind this question is that a smaller gap permits less energy to escape sending more of the force down the barrel.
My reading of history convinces me that most bad government results from too much government. Thomas Jefferson