mancraft sdik cylinder vsr 10 90 graders aftraekMancraft's Sniper Drop in Kit (SDiK) that lets you convert a spring fired rifle into gas, typically either Co2 or HPA. The system is designed from the ground up and has gone through several generations as well as patent, the whole system built around a reliable gas system. The SDiK is designed not to slide on other parts of the rifle, ie. that you do not need to upgrade either the trigger or the cylinder to get it running. Once the system is