Sure --- paint away, Krylon is what 6 bucks a can and can be redone anytime you please, other stuff might be 25 bucks a can... on a user gun like that just spray away.
Heck what do you think our guys in the sand box do? Whatever works.
As to fears of jamming it up... heck It's an 870, unless you pour paint in the action, it will be fine.
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