How to swapping gun?

Please help)
How easy it is to change one weapon for another while discarding the old one?

Hello! In fact I dont understand the question… Do you mean swap animation?

Well to swap weapons you would have to make animations, two for each gun. One gun should have an equip animation, and an unequip animation. It also depends on if you are using third person or first person. If you are using third person you would have to properly position it to sockets and stuff like that. I’m not a professional so here:

FPS: Unreal Engine 4 Tutorial - Shooter - Part 13 Weapon Switching - YouTube
TPS: UE4: TUTORIAL #27 | Switching between weapons (Third person shooter - YouTube

Hello!

How to drop current gun when I pick up another one)
I really don’t know how to do it.