I bought a nova 20 ga for my wife and we played around with some htl loads and chokes in the off season. I thought we had a loose enough pattern at 20 yards but we lost one and she wounded another and had to run it down. I don't want to go buying more chokes if I don't have to and want to be able to use the gun for ducks and doves. I want to put an aftermarket sight system on thats better than just the bead but dont want to drill and tap it if i can get away with it. So i was wondering how good are the magnetic sights you can buy? Or what do you all suggest?