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7.5" of my own design, 0.125" gas tap at 4.7" I have some issues with cycling when loading short rounds (to make mags stack properly). I am currently trying to work out a load that will cycle 100%.
When I load rounds to 2.20" OAL I have no cycling problems but the rounds don't stack well in the mag and I can't get FA fire to work properly when more than about 15 rounds are loaded in a mag.
It will not cycle subsonic without a suppressor.
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