How do I combine weapons with special characteristics?

I have a "Suppressed Hardened 10mm Automatic Pistol" with the following parts:

I like this a lot, however I have now found an "Instigating 10mm Pistol", which gives double damage on full-health target, but has these parts:

I'd like to transfer the "Instigating" benefit to my Suppressed Hardened 10mm, but I don't know a way to do this.

Should I instead dismantle my favourite pistol and add all its parts to the Instigating 10mm?

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