It's showing it's age and it's one of the least used guns in the entire game. Not exactly the right legacy for the" Rifle that won the West"
So I suggest a total redesign to better fit that title. Functionally, the exact same animations will work just fine, only with one added step. Though discontinued by it's manufacturer the Model 464 is still a wonderful rifle and close to te original model.
This would feature improved iron sights, a 5 round capacity, an appropriate re-class and improved ammunition.
A distance of 200ms is perfectly possible with MODERN AMMO and more effective projectiles mean it's more capable than ever. I'd suggest classes 3-7, it's more fitting for the rifle and makes it much more usable for many different maps and loadouts.