For a pellet rifle, Yes. For a BB gun, No. BB guns are inaccurate by design. They use a smooth bore barrel whereas most pellet guns use a rifled barrel. This will take advantage of the red dot.
Not economically feasible.
Yes there are several Red dot sites made just for BB guns and rifles. As long as it has a mounting rail on the gun it will work.
there is a Nerf red dot sight available at target, but they are EXTREMELY hard to find and its unknown if it was discontinued, frankly the quality control is rather poor, much like other attachments,...
The Red Ryder BB Rifle can only be adjusted for up and down not left or right (windage) Select a target about 20 feet away. ( beyond that the rifle is not very accurate, that the nature of BB guns...