Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Realistic Turret Pack Free.
Realistic Turret Pack v1.0
Five realistic turrets. Suitable for military, tower defense or weaponized racing games. Can be used stationary or on vehicle. Guns can be detached from base and used separately.
•3800-7500 tris each including 3 LODs
•Two editable colors in layered PSD
•2k textures: albedo; metal, gloss; occlusion; normal
•PBR textures (Unity 5 only)
•Each turret consists of three parts for animation
Have no animations, scripts of effects.
Perfectly fit for Apocalyptic Cars and new Realistic Turrets 2