The leak is from the top valve linked in 4boosts post, I have confirmed the largest oring has snapped. many thanks for the link.
I'd disagree, having now dismantled one calling the magazine a three chamber design is being very generous, there are two internal lips but I doubt this has much effect on cooldown. I would attribute the favourable characteristics of the magazines gas chamber to the large volume of the magazine more than the divisions. My issue with them is more to do with the extra seals required for the three part design leading to more places that can leak, if WE's plan w