designed by Sergei Simonov in 1938, the PTRS (Simonov Anti-Tank Rifle) uses the same 14.5mm round as the PTRD bolt-action anti-tank gun, but with a magazine fed semi-automatic action. While the PTRS fell to the wayside, both due to the ease of manufacture of the PTRD and the growing thickness of Nazi tank armor, it found a second life in the form of the SKS semi-automatic rifle, which took the PTRS action and scaled it down to the 7.62mm cartridge. Fitted with a disc-shaped muzzle brake, hooded pin front and tangent rear sight, swiveling bipod and carrying handle. The receiver is fitted with a bottom-opening integral magazine, a smooth pistol grip, and a club foot buttstock with multi-layered recoil pad.