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M4 / Gas Plug O-Ring / Grease or not?


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Here is the deal, when I first dismantled the Gas Pistons, I saw that there was some grease on both of the O-Rings. Not on the pistons, on the rubber O-Rings.


My M4 Supplier (merchant), said NOT to lubricate/grease the tubes OR the O-Rings at all.


The manual says:

according to the ammunition type used, periodically dismantle

and clean the gas cylinders and gas cylinder pistons.

NB: the gas system must not be lubricated.


However there is no word on the O-Rings which from factory had grease. Shall I apply grease on the rings or not?

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