Century Armss heavy duty AK rifle the VSKA viskuh has been reengineered with critical components using machined S7 tool steel. The VSKA rifle features a bolt carrier front trunnion and feed ramp machined from S7 tool steel and specially heat treated for maximum durability. The front trunnion and bolt are machined from billet and exceeded the durability goals for the project. Additionally the VSKA features a carburized 4140 steel bolt a chromoly 4150 barrel and sports the RAK1 Enhanced Trigger Group for an impressive trigger pull. Guns.com Full Review of the VSKA Russian Red.