5 pounds and up
Generally, not less than 50 pounds, including rifle and ammunition
No
9+ pounds.
152 pounds without the rifle
It all depends on who made the air rifle and the power plant that the rifle uses.
The M16A1 assault rifle weighs 6.5 pounds (2.9 kilograms) unloaded, lighter than the M16A2 which added a thicker barrel, bringing the weight to 7.18 pounds (3.26 kilograms).
The weight of an M16 rifle without a magazine or sling is approximately 7.2 pounds.
An iran sniper weighs 50 pounds
$30 USD in 1942 or 7.14 pounds
If you mean a rifle chambered for the .50 BMG cartridge, such as the Barrett M82, the EFFECTIVE range is about 5,900 feet. The rifle weighs about 30 pounds, and sells for about $9,000.
Canadian tire
The cheapest airsoft sniper rifles are aroung 100 USD or ~60 pounds. Besides that if you want a rifle that will not break after a few months you will need to pay almost twice as much.