So I noticed this issue recently (not really sure how long it has been happening), when firing in single action, I noticed what felt like a gritty pull, not the usual crisp single action, and working a little more carefully, I found that there is a point where the sear releases, but the hammer doesn't fall, instead I can release the trigger and the weapon de-cocks along with the trigger, it's a significant enough 'shelf' that I can do this every time feeling 2 separate points of release. This is a little alarming and though it still functions normally if I continue to pull the trigger back, it makes for a very odd and bad-feeling trigger pull, I've never really taken apart the trigger workings of the sig (or any other semi-auto handgun) so I wouldn't know what to look for that could be causing it. Though I did take the slide off and notice if I push down slightly on the trigger bar, that it gives me the nice crisp single action release I'm used to, but it doesn't function in double action with it pressed down like that. Any ideas? Could it be something simple or should I have a gunsmith take a look at it?