Those parts look great.
But they also look expensive.
I really dislike the rear sight of the Sub2K. In fact I almost purchased a HiPoint, over the Sub2K just because of the rear sight. So I would be interested in a new rear sight. And of course if I purchased a new rear sight, I would also get one of your new front sights.
My Sub2K is not reliable enough to be anything more than a fun gun. Fun to show people, and fun to shoot. So I don’t want to put too much money into one of my “fun” guns. Therefore I personally would not spent more than $70 for a set of new sights for the Sub2K. Thats for both front and back.
I know thats not much money for 2 after market parts, but this is a cheap gun as far as carbines go.