The smallest 4 x 20 and 3-7 x 20 Light AIR models are designed especially for air rifles, which can also be inferred from their name, but they can also be used for small rifles....
The smallest models 4 x 20 and 3-7 x 20 Light AIR are mainly designed for airguns, which follows from their name, but they can be used even for small-bore rifle.