Duplication question

[matt]

I want to make a Duplication power, like I am holding a diamond then I am holding two diamonds. Or I'm holding a comic book then I am holding two comic books.

Duplicate (4)

Qualities: U

Extras/Flaws: Permanent +4, Only works on non-living targets -1, Can't be more powerful than the original object -1.

Capacity: Mass

Effect: You can make a duplicate of an object you are holding.

If you make a duplicate of a knife or gun it can't be more powerful than the original, nor have more bullets. If it's an empty gun, then you get a duplicated empty gun.

Does this look reasonable?  

Thanks,

Matt