The first anti-tank came out when the first tank was fielded, in WW1. It was a bolt action rifle.
M40 106mm recoilless rifle.
14.5x114mm
Probably the Russian built PTRD-1941 anti tank rifle in 14.5 mm.
A large caliber firearm that is intended for use against structures or vehicles, as oppose to the more common anti-personnel role. The WW 2 Boys anti-tank rifle (.55 caliber) or the Lahti 20mm would be examples.
For modern rifles I think it's a 60 cal it was an anti tank rifle in world war one or two. On google search modern firearms anti tank rifles and that website has it on there
the barrett .50bgm rifle is not a sniper rifle as most people call it. it is technically an anti-material rifle which is the modern name for an anti-tank rifle. it is used against lightly armored targets such as anti-aircraft guns truck cars apcs etc. it can penetrate these targets making them inoperable or killing the targets inside. but it is used as an anti-personnel rifle bc who can argue with the killing power of a .50cal at 1000yds
Of the rifles actually dubbed as 'anti-tank' rifles, it would have been the Boys .55 inch rifle. Although many of them were rechambered for the 12.7x99 (.50 BMG) cartridge in the 80s, when the concept was revived in the form of heavy/anti-materiel sniping, the .55 Boys cartridge was considerably more powerful than the BMG cartridge.Of heavy sniping/anti-materiel rifles, the most powerful would currently be the South African Denel NTW-20x110 and Croatian RT-20, which fire a 20x110 cannon cartridge originally intended for use in the Hispano-Suiza aircraft cannons.When you say "man portable", I'm assuming that you're referring to systems which can be transported and operated by an individual. Weapons such as the 37mm anti-tank guns of early WWII could possibly be wheeled around by an individual for short durations, but they were crew served weapons.The world's most powerful anti-tank rifle is Japanese type 97 20mm.
The Henry rifle was invented by Hackman Adams.It was invented in 1860.
A tank can do far more damage than any rifle.
The first automatic rifle was invented in 1884. It was invented by Manuel Mondragon. The rifle was known as the Mondragon rifle later to be known as the M-1908.
The rifle was invented to let people aim and shoot guns farther.
Are you asking how do you swap and air tank on an air rifle, or swap for and air rifle? In most air rifles you put it on safe and swap out the tank by unscrewing it and replacing it.