Century RI3284-N VSKA AK47 7.62x39mm AK-47 Century Arms introduces its newest heavy duty AK rifle, the VSKA (vis-kuh). Re-engineered with critical components using machined S7 tool steel, the VSKA is the result of a special development program for a United States government project that was finalized in 2017. The VSKA rifle features an all new bolt carrier, front trunnion, and feed ramp machined from S7 tool steel and specially heat treated for maximum durability. S7, often referred to as a â€œShock-Resisting Tool Steel,â€Â is commonly used for tools like chisels and jackhammer tips as it has maximum shock resistance and high compression strength, while retaining toughness. 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 chrome-moly 4150 barrel, and sports the RAK-1 Enhanced Trigger Group for an impressive trigger pull.