Chocolate coating

[A4Brogan]

make everything really greasy and/or jammed?

Silly goon/pubbie, guns REQUIRE a good amount of lubing to function correctly!

That, and if we are going into Physics, Iwould reckon that, if anything, chocolate would be either vaporized by the hot gases emitted from the casing, or just foul the everloving crap out of the barrel in a way that would make a gun-nut cry.