MatViz
Really nice model and renders
Texture information:
Gun:
Tris count: 8390
4096*2048, .png :
DirectX Normal (png ), Albedo (png), Roughness (png), Metalness (png), Height (png), AO (png)
Scope:
Tris count: 4186
2048*2048, .png :
DirectX Normal (png ), Albedo (png), Roughness (png), Metalness (png), Height (png), AO (png),Opacity (png)
Conctact if u have any questions or for additional texture sets and file formats.