During World War II, the German army invaded Russia as part of Operation Barbarossa. By December 5, the German 2nd Panzer Division had advanced to within a few kilometers of Tula, forcing the Soviets to evacuate Tula Arms Plant. As a result, far fewer weapons were produced there than at other Soviet factories such as Izhevsk Mechanical Plant. Consequently, Tula weapons of World War II are considered more valuable by collectors.
Tula Arms Plant is best known for manufacturing the VSS Vintorez, AS Val, and TOZ rifle weapons designed by TsNIITochMash. During the Soviet era, Tula Arms Plant produced other military rifles, including the Mosin-Nagant, SVT-40, AK-47, and SKS. It was also a major producer of the M1895 revolver.
The Tula Arsenal markings are usually a star with an arrow.
Earlier markings are a star surrounded by small circles
Tula Arsenal is still active today manufacturing weapons for both civilian and military needs
here is there web site