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Just to add to what stalker posted,
You didn't do step 12!
I pressurize, ever so slightly, to help prevent too much sealant from slowly oozing inside. But after it'd cured, I also fully gas it up and vent the entire mag inspecting for bits of extruded sealant.
I've had a couple with too much sealant inside so eventually became aware of where and how much I put in.
Of the mags that I've had leak again, it was only because of rough careless use dropping them on hard surfaces which changed the shape of the mag so the floor plate didn't seal anymore.
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