Originally Posted by morrisman68
I often muse on the scene from one the 'Dollars' films - the Spaghetti Westerns - where the man with no name goes into a gunsmiths and fiddles with (Colt?) revolver components, fitting them and spinning them, until he finds a set where the manufacturing tolerances have lined up in favourable coincidence. IIRC he then holds up the shopkeeper with it in lieu of payment....
I spent many 'happy' hours, as a non-professional armourer, swapping and/or polishing small parts in HM's 9mm Browning pistols to enhance their 'shoot-ability' for the RAF Team. (I was taught by a proper Armourer).
Whether it's 0.1mm or 0.1cm or whatever, it can make a massive difference when all the other components are involved.