M9 Bayonet
Includes .blend of the object, and PBR textures from Substance Painter, plus textures for Unity 5's Standard Shader.
--- Appending into a Scene ---
1 Open the .blend file of your scene
2 press Shift F1 or File -> Append
3 find this .blend and select it
4 go into Object
5 select M9 Bayonet
6 press "Link/Append from Library"