Check w/ Browning, but I think you are correct- BOSS will interfere with iron sights.
There are a few places you can find a Rear sights for a Savage Model 120. The most popular place to look would be online or a gun store.
Best to ask a gunsmith for assistance
Grips, magazines, sights.
No.
No
Fixed pin sights are typically better for precision shooting at specific distances, as you can adjust the pins for different yardages. Pendulum sights are useful for shooting from treestands or elevated positions as they automatically compensate for angle changes, but may not be as accurate for long-distance shooting. Ultimately, the choice depends on your shooting style and preferences.
50-500 usd
Most aftermarket sights are fiberoptic types such as Williams FireSights or the Tru-Glo sights. I dont know of any specific target applications.
try here http://www.brownells.com/aspx/NS/Home/default.aspx or try Williams Sights I don't have the link handy
Did you go to Browning on line? Most gun sights will tell you. Mine is #303xxx and was made in 64.
The Savage model 3 series featured a 26 inch barrel,or 24 inch barrel(post War),with open sights,plain grip stock.These rifles were produced from 1930-1947.