Lowpoly Sci-Fi: Modular Turrets
https://assetstore.unity.com/packages...
This is convenient package to easily create beautiful turrets. 50+ subelements grants you ability to have almost infinite turrets variations.
(12 nice example turrets included in different colors - 80+ prefabs)
Comes with 7 color schemes and source file to create your own. All maps you may need are there - diffuse, specular, normal and emissive (2048x2048 and 1024x1024 versions).
Low-poly and optimized for mobile devices. All textures are in atlas and assembled turret starts from 300 tris only!