You will need to specify the use.
There is NO Best and inexpensive air rifle. A good quality air rifle is going to cost you money. A cheap air rifle will reflect it quality by how poorly it performs.
One of the best is a Feinwerkbau Westinger & Altenburger. Biathlon Air Rifle Model P700 Aluminum. Average cost $2,480. It's an Olympic Match Rifle.
buy one
One of the best is a Feinwerkbau Westinger & Altenburger. Biathlon Air Rifle Model P700 Aluminum. Average cost $2,480. It's an Olympic Match Rifle. The best air rifles for target shooting are Olympic Biathlon match rifles.
Some scopes can cost more than the Air Rifle. Leapers makes some excellent scopes for around $250. Whatever scope you purchase make sure it is designed for air rifles. Air rifles, because of their forward / reverse kick, can break a regular hunting scope not designed for this type of rifle.
One that was designed for air rifles. Best will be determined by your intended use and how much you spend.
The "Best" is really up to the user. What is best for me, may not be to your liking. I suggest you read reviews by owners and make a selection that way. See the link below, it not only provides choices but owner reviews on each rifle / pistol. Just open the link and then open each rifle you like and read (at the bottom) the Owners reviews. The web link has almost ever air rifle available on the market today.
you can't
1. Winchester.
Best left to a trained professional.
Best left to a professional.
Try oiling of the gearbox.