I had just bought my son a CZ 513 farmer, and it shoots nice little tight groups at 50yards. But they are about 6 inches high and I'm out of adjustment on the rear iron sight. This gun is for 4-H so we have to get the iron sights on. Is there a way I can replace the front sight with a taller one? I plan putting a scope on it an just taking it off for the 4-H matches. Any help is greatly appreciated.