I would fully strip it down... tape in the safety tab indent as paint cannot lead to a smooth Mossberg safety...
From the inside, tape off the trigger group opening and ejection port leaving just the mag access port and barrel hole to be filled with tissue to keep paint out of the receiver where it could also bugger up in the action etc...
Screwing your stock bolt back in gives a good place to hold it while painting as well as fills that hole too...
As for barrel, you will see the close tolerance areas on the mating surfaces that go in the gun...
Brent
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