I’m thinking about trying a straight pull manual bolt setup. I already run side charge uppers so it should be easy enough. What I’d like to find is a gas block that can be turned on and off with a 1/4 turn like an M1A. An adjustable block is too much of a PITA to shut down and often doesn’t close all the way. I’m familiar with the KaliKey but it still vents gas into the receiver, negating the advantage of the all the gas going down the barrel and therefore less consistent. A simple on/off would be optimum.