Zastava M12 Black Spear

The Zastava M12 Black Spear is a 12.7mm or .50 caliber anti-materiel rifle developed by Zastava Arms of Serbia
Description.
The M12 is based on the Mauser action. The barrel interior is chrome plated, and on the exterior has flutes to improve cooling. It has a muzzle brake to help reduce recoil.
The trigger pull and position can be adjusted; a safety mechanism is also incorporated on the trigger. The stock is made of aluminium and has a built-in buffer, to further reduce the effect of recoil, and a third folding leg, which can be adjusted in height, to complement the bipod assembled under the barrel.
It can be chambered for either 12.7×108mm (maximum range 1,800 m) or .50 BMG (maximum range 1,600 m) ammunition. On top of the chamber has a Picatinny rail to fix different types of optical devices.