Should the thumb safety be able to move/raise up at all when hammer down? Fitting a WC and hadn't noticed this before. Went back and checked some of my other 1911s, some move very little some move more. This one actually moved enough to block slide, but pretty square slide stop corner where others are eased. Eased this one just a little, doesn't interfere any more (but still moves up obviously), should have taken a picture first, sorry.