Mancraft'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 installed, the rifle can be charged with a single finger.
With a tight setup, the output speed varies by less than 1 m/s.
In some rifles you may find that the rifle needs to be slightly modified.
Included in the kit:
SDiK cylinder.
1.4m 4mm air hose.