Does XP boost from VVIP weapons stack?

I have an M4a1 Obsidian Beast and seeing as payday has been and gone i fancy getting an AK47 Iron Beast. But I will only buy it if I can benefit from the additional XP boost if its in bag 2, when my M4 is in bag 1. i.e will i get 400% exp boost as opposed to 200% which im getting now? Hopefully someone can confirm.

Thanks guys.

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