This is one serious rifle:
The NTW-20 is a South African anti-materiel rifle or large-caliber sniper rifle. (I assume materiel is french for material)
An anti-materiel rifle (AM) is a rifle that is designed for use against military equipment (matériel) rather than against other combatants (“anti-personnel”).
The NTW 20/14.5 is one of the few firearms in existence that allow the changing of the caliber without completely disassembling and reworking the weapon. Switching between the two calibers of the NTW (20mm and 14.5mm) requires changing the bolt, barrel, sighting gear and magazine. (A third variant, the NTW 20×110 has also been developed, but is not designed for barrel caliber switching.) Caliber switching the NTW 20/14.5 can be accomplished simply in the field without specialized tools. The magazine protrudes from the left side of the receiver. The NTW can be disassembled and packed into two backpacks for carriage. A muzzle brake is fitted on the end of the barrel which absorbs an estimated 50%-60% of recoil. This is further supplemented by a buffered slide in the receiver.
I don’t know what kind of scope they have on there, but the eye relief is insane.
More info on the Wiki page – HERE