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your problem is the pistol length gas tube, you need to use a carbine length gas tube to be able to cycle your action on an SBR.
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I am not following, a pistol length moves the gas port closer to the point of ignition and allows more “runway” and a longer time for gases to be used to cycle the action before the bullet leaves the barrel. If anything I thought a pistol length has tube
is *supposed* to increase reliability in shorter barrels. Just not mine I guess.