Reliable, not overly accurate, not a fan of the way the gas operating system is designed, clamped on gas block and front of the op-rod is not attached to anything, it rides on a metal liner inserted in the forestock. There is no moving piston, there is a fixed pipe clamped into the gas block that goes into a hole on the front of the op-rod, it blows gas there, kind of like an upside down AG42. I think most of the accuracy issues come from the gas system design, lots of ways for gas to leak, and there is no regulation of the gas.