I did modelling with Blender and I did texture with Substance Painter latest version. I uploaded this model as high and low poly. The High Poly Model is in .blend file. 4K UV MAP, 4096x4096 maps and textures. Unity 5 and Unreal Engine 4 Maps rar files an other All maps is in rar file.

Game Ready

Unity 5 /Unreal Engine 4 ( Old Rusty Barrel and Chemical Old Barrel )

Low Poly /Game Ready

Model Name : Old Rusty Barrel / Vertex:5,456/Tris-Polygon: 10,776/

Model Name : Chemical Old Barrel / Vertex:3,416/Tris-Polygon: 6,716/

Model Name : Old Blue Barrel / Vertex: 11,744/ Tris: 23,352

Available File Formats: - OBJ - FBX -3DS-ABC-BLEND

Antialiasing : Subsampling 4x4

*Albedo 4096x4096

*AO Map 4096x4096

*Normal Map OpenGL 4096x409

*Metallic Map 4096x4096

*UV Normal Map 4096x4096

Unity 5 Maps:

AlbedoMap: 4096x4096

AO Map: 4096x4096

Normal Map: 4096x409

Metallic Smoothnes Map:4096x4096

Unreal Engine 4 Maps:

Base Color Map: 4096x4096

Normal Map: 4096x4096

Occlusion Roughness Metallic:4096x4096