How to integrate Military Weapons pack into FPS?

Hello and thank you for your explanation and pictures.
For step 1 and part 1 of step 2 i was watching this YT Tutorial ( ?v=fyC57urfKtE ), but got into some trouble with collision. How/Where do i disable collision?

Sadly i am not able to follow your steps from this point of step 2 on: “…After that open the static mesh and also create a socket called muzzle”. How exactly do i have to do that?!