The AK-47 model includes separate LODs, which need to be manually imported. The materials are not pre-linked; create a material and assign the necessary textures. Note that there are no moving parts. The Blender.zip and Unreal Engine.zip archives contain textures only, while FBX files are in the ak47 - lods.zip archive.
LOD0
LOD1
LOD2
LOD3
LOD4
Blender Textures:
Unreal Engine Textures: