Interesting you mention this, as I think I know what you mean. I have an SD-C (which I am finding to be awesome!)......and I put it in two different lowers. On one lower (a near new one), the first stage felt a little bit more more "rough" than in the other one, which is very well used. And when I say a little bit....that is really what I mean....I'm not sure I'd have actually noticed without having tried it in both of them. In fact "rough" is really far too stronger a word....should really be "just not quite as smooth as in the other one".
Now....I have kept the trigger in that newer lower, and have just been routinely greasing and lubing....and have probably gotten 800 rounds on it in there now. And....I am pretty sure that tiny little bit of roughness, or drag, or whatever you want to call it has now gone away completely.
I just wonder if it could have been the precision fitting Geissele pins just somehow settling in to the holes or something (and as stated, I'm really splitting hairs here)....but in any event, if the trigger is functioning good, I would suggest just really lubing as per the instructions and then shooting it some....and see how it goes. As a secondary possibility, I also wonder if perhaps little tiny manufacturing variations in the lowers could be contributing.



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. 
. How much damage really could have been done? I'll switch them out ASAP but I hope I didn't damage it too much, I just spent $170 on it!

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