made a low poly turret recently. if you need low poly game assets modelled, check this out. https://www.fiverr.com/mehedikhan_/create-low-poly-3d-models-for-your-games : r/Unity3D
Low Poly Guns - LordArt - GameDev.net
Turret designs, themes, templates and downloadable graphic elements on Dribbble
Entry #19 by haroldwithers for Concept - 3D Modelling for Game Turrets (Low Poly) | Freelancer