Master Weaponsmiths can now reverse-engineer stolen weapons into their component parts. Begin by crafting a Weapon Component Analysis Tool, using high conductivity metal. Quality matters here, so use the best you can find.
Then add five of the same type of stolen weapon to your crafted tool.
Finally, use the radial menu to Reverse Engineer. This will average the stats of the weapons you are analyzing, and provide a bonus, based on the quality of your tool.
When done, you'll have a newly-made weapon component, specific to the type of weapon you analyzed.