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when using Mob Up! are you allowed to exceed the number of special weapons and unique characters in a unit. E.G i have a unit of 30 shootas down to 18 boyz but i kept all 3 of my big shootaz via disposing basic boyz. Can i merge with a unit of 10 that has 1 big shoota even though it would push me over the allowable limit (1 in 10). And does this rule work the same way for unique characters (i.e mixing 2 boy squads that each have a Boss Nob?

Yes you can

Yes, that's fine. You're following all the rules when you create your army.