Hello everyone. Currently i’m working on an inventory and weapon system. It almost finished but still working on a couple of bugs. Also the videos are not updated version. I added drag and drop functionality and some cool meshes. I will publish updated video on youtube tonight. And i will also update this post. I hope you guys like it and let me know what you think 
First Video: [ WIP ] Advanced Inventory & Weapon System | UE4 - YouTube
Update 1: [ WIP ] Advanced Inventory & Weapon System | UE4 | Update 1 - YouTube
Last Update: MARKETPLACE - Advanced Inventory & Weapon System | Old Promo Video | UE4 - YouTube