This is a simple backup iron sight, that was done on a request.
Important: Weapon model and textures only
Tris/Verts: 3 234 / 1 872 verts
General PBR textures: BaseColor Metallic Roughness Normal AO
Unity 5 Textures: Albedo MetallicSmoothness Normal
Unreal Engine 4 textures: BaseColor OcclusionRoughnessMetallic Normal