Remove the O-Rings, leave them to soak in silicone overnight, apply a small amount of thick grease into the channel for the O-Ring, fit O-Ring back, apply thin layer of grease ontop of O-Ring.. using thick grease is advisable... I have used high-lithium water-pump grease and it's served me well (up until i decided to use liquid gasket, but that's on my pistol mags)
i usually 'dip' my O-Rings in the grease to make sure i have a generous layer.
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