Lets see...your options are
-drill and tap the reciever for a rear ghost ring and solder a front sight onto the barrel
-drill and tap the reciever for a rear sight then get a banded front sight
-solder both a front and rear sight onto the barrel
-drill and tap the reciever for a scope rail and mount either a scope or red dot
-find a saddle mount and mount a scope or red dot
I turned my vent ribbed Mossberg 500 into a home defense/deer hunting slug gun. Luckily my reciever was drilled and tapped and mossberg makes a ghost ring kit. All I had to do was knock off the vent rib, cut the barrel down, then silver solder on the front sight.
No matter how you look at it, with the exception of the saddle mount if you can find one, you'll have to get a gunsmith to fit universal parts onto your gun since it is not drilled and tapped.