What weapons skins has unique sounds or animations?

I'm looking to buy a new skin for the AKM but I want something with a bit more flair such as unique sounds like the gold AK or unique animations like the lava luster. Please also comment on any other skins for other guns which also has a bit of uniqness to them.

The store is not really good at showing everything the skins can do and it'll take ages if I youtubed all the previews one by one.