RClark
since these don't have adjustable sights you have to pick a range you want to zero in at.
might be high at 15 and dead on at 45.
so decide before filing etc, at what range do you want it to be poa - poi?
If you are always going to shoot at 15 yd then adjust (file) the sights for that.
actually in this case a taller front sight.
Or the other option. LEARN WHERE THE GUN SHOOTS AT VARIOUS DISTANCES.
then you adjust your aim to compensate I've done that with all my BP guns with none adjustable sights.
Course I rarely shoot at paper targets anymore. My common target is a 4x4 by 8" long
I drive a piece of rebar in the ground. I drill a hole in the end of the 4x4. set it on the rebar
I now have a target 3 1/2" wide and 8 " high.
If I only nick the edge, it will usually spin a little side ways. Now my width may be only 2 1/2'
Learn where the pistol shoots.