I upgraded to these. MUCH better than stock.
Williams Fire Sight Set Ruger Mark II Mark III Bull Barrel Government
I have used Ruger target sights since 83 and I have to say, my wife's 22/45 which is her training gun, is getting the front Fire sight. My Brother went to them first and I am sold now. For something like FNS it will rock.I upgraded to these. MUCH better than stock.
Williams Fire Sight Set Ruger Mark II Mark III Bull Barrel Government