Integrating those weapons info FPS Game Starter Kit is relatively easy, plus I already did most of the heavy lifting and prepared pre-configured weapon child classes that you can just extract and start using the weapons right away and fine-tune as you see fit.
1. Create a new FPS Game Starter Kit project and add Sci-Fi Arsenal Vol.01 to it
2. Download end extract the pre-configured weapon child classes that I made, you can put them anywhere inside the Content folder. Use Windows Explorer (or whatever your default file browser is)
3. Add them into the level
To learn more and expand it further, check out these tutorials: