Not really sure what you're asking. Do you want to remove the Front Sight to replace it with another? It will drift out either side for removal. Take a Flat Tip Punch and hit Base of Sight once Barrel of Rifle is secured to keep from rolling while striking Sight. Found that 2 People works best. One holding Rifle and one to knock out Sight.
If you're shooting at Target and it's hitting left or right of Bullseye, then the Front sight is drifted very slightly, the opposite way to correct. If out in Field, I've corrected Sights by putting Barrel up against a Tree and tapped heavily with a Flat Tip Punch/Hammer to move, then reshot to get on Target. Repeat if necessary.
I know this isn't the Gun Smith way of adjusting a Front Sight correctly, but Down-Home Gun Smiths use whatever sources they got available to get the job done, and 99% of the time, they don't tear up their Guns, and usually these Guys know enough about Guns that, that's who you take your Gun to to save money. However if you want to do it correctly, Brownell's, MidwayUSA and other Gun Accessory Stores have a correct Sight Tool that do adjustments.
Have you been the only owner of this Rifle? It sounds like you got used, and somebody replaced the Sight with an incorrect model and it doesn't fit the Dove Tail accurately.