If you get a Brownells catalog, they have a wide selection of sights to choose from. If you are going to stay with shooting open sights, I'd change them out for something better that you like.
A scope makes a huge difference in accuracy, if you are going to scope it, the least expensive scope I'd go with would be the Mueller APV. It's a 4 X 14 X 40 AO scope and has very good optics for the price (About$130.00)
Be sure you get a scope that is an AO scope so that you can adjust the parellex for the distance you are shooting at, it makes a huge difference in your groups. If the scope is not correctly set for parellex, anytime you look at the retical from just a slightly different angle, it will change the point of impact, when the parrelex is adjusted right on, the retical won't move from the target when you look through the scope at a slightly different angle.
It's really important. A scope with a parrelex fixed at 75 yards, will only be on at 75 yards, it will be off at any other distance.
The Guys at Rimfirecentral all really like the APV scope. There are better scopes if you want to pay the money, but for the price you will get an AO scope, decent power and good sharpness, right to the edges of the glass and decent light transmission, a lifetime warrenty also.
I used one for a long time before upgrading to a much more expensive scope.
, John K