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The way the trigger mech is contained there's very little chance grease is going to migrate from there to anywhere with a rubber bit.
And the external bits of the bolt don't interact with the nozzle at all.
So...you shouldn't have any problems.
If you pull the nozzle forward enough you'll see the oring on the end. It's essentially the piston...and the interior of the bolt is the cylinder. As long as you keep that lubed with rubber friendly lube you're good to go.
Personally....I just use ultralube/whatever-brand of clear gel PTFE lubricant that I use for everything. A couple of drops of heavier weight silicone oil doesn't hurt either.
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