"...250 yds. to make it hit POA..." At what distance?
It's the front sight, but you do not file that to lower the POI. Front sights get moved in the opposite direction you want the group to go. I'd be inclined to find a matched set if you can. Vs fiddling with the front blade.
Or you could just shoot it the way it is. Knowing where the thing shoots is most important.