It is a kind of weapons that specialized in long range distance. In milirary and law enforcement terminology, a sniper rifle is a precision-rifle used to ensure more accurate placement of bullets at longer ranges than other small weapon like handgun or semi-machine gun. A typical sniper rifle is built for optimal levels of accuracy, equipped with a telescopic sight. It means that distance isn't a big problem for this kind of weapon provided that the distance traveled does not exceed the limits.
America is one of country producing high quality sniper rifle. Here the example..
~> Barrett M-82A1 (XM107)(America)
~> RPA Rangemaster 7.62 (U.S.A)
And the other hand,Europe products sniper rifle too. Here some example..
~> H&K PSG-1(Germany)
~> Walther WA2000(Germany)
~> Accuracy International Super Magnum (L115A1)(Britain)
~> Sig Sauer SG 550(Switzerland)