It was early, but not the first.
It is believed that sniper rifles were invented around 1857 with the advent of the Enfield rifle. This rifle was then surpassed by the Whitworth rifle which became the first long range sniper rifle.
Yes.
10-1000 USD depending on specifics
50-400 usd
The British made 'Baker Rifle' was the first widely used Infantry rifle in the early 1800's
$300-550, depending on exact model and condition.
The top ten weapons used in the Civil War were the Springfield Model 1861 musket, the Enfield Pattern 1853 rifled musket, the Spencer repeating rifle, the Colt Model 1860 revolver, the Henry rifle, the Whitworth rifle, the Sharps rifle, the Gatling gun, the Dahlgren naval cannon, and the Parrott rifle.
The Ferguson Rifle
Mexico, 1887- the 7mm Mondragon rifle
No. The first gas-operated rifle to be adopted by a military was the Mondragon rifle used by the Mexican army.
The first gun with a rifled barrel (a rifle is any gun with grooves cut into the barrel to give the projectile spin) used by American forces was the Kentucky rifle, used in the revolutionary war.
The British used the Baker rifle in the war against Napoleon.