NDS Sights anyone tried them?

[dogtagg88]

Wanting feedback on NDS sights discussed here, I want to try them on my 30-30 and my Tracker 1 20 ga...was wondering if anyone had tried them on these models and if they needed new front sights?  My Tracker 1 went to the range, shoots great groups with 2 different slugs NOT where I want them and the factory sights are adjusted as far as they go.  30-30 has a red dot that hits good first shot then begins to wander around as rifle heats up.  Thanks, DT

[gcrank1]

Barrel heating/group widening is 'normal', see what it does for group if you let it cool between shots.
On the other, where does the group print at what distance with what POA? There are charts to calc how much correction you need, or someone here can do it for you, to find out more about the suitability.