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Interesting to see how the mag leaked a little pish of gas when it was removed. It makes me think that they're not putting a fire valve in the mag which is struck with a firing pin with each shot like on most GBBRs. Instead it looks like a valve is opened with the mag is received and various seals have mated. Makes me think that they're not using a moving nozzle interface to the mag.
It might make it more important to keep the mag gas face sealing features clean (i.e. keep your mag tops clear of any dirt). On the upside, the design facilitates running an external gas rig because you don't have to mate through a removable mag.
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