How to integrate Military Weapons pack into FPS?

Thank you.
Unfortunately i´m not able to follow your steps from 0:33 on, because in my Game\Bluescripts folder there is no “weapon_mesh” data. I only got “My Character”, “MyHUD”, “MyProjectile”.

Here is 1 Picture from the mesh folder that came with the MilitaryWeaponPack:
ec90112f2b9c11e5e64da407dcfea4c5f3aef234.jpeg