Deadly Weapons Graph
Dude! you are the creator of the “Barret” MOD! 
lot of people love it! so is a pleasure to help you out!.. my MOD do exactly what you want! checkout my Graph… Im really proud how I did it 
Basically you need to put this Graph into the Main BP of your “gun or proyectile” (the one who hold the meshes)
Ajustar = “SET” + (your variable name)
Rama = “Branch”
Crear = “Make” + Instant Config Data