A long time back Foley-Belsaw gave out Magestics. Maybe they gave out whatever they had??? - What I was wondering was - has anyone taken a snap-gun apart? In all likelihood, they are not the most finely-tuned precision instruments on the planet (I could be wrong on this....).
Is it possible that the adjustment screw is a long sucker? Therefore it may be adjusted way loose to begin with and the minute adjustments most people would make won't bring it up to a well adjusted one except for a really long time screwing (sorry; that sounded foolish but you know what I mean).