Cannon has been modeled from some of the low-quality civil war field cannon images, all details tried to be added to the model but there can be some differences or missed parts that I couldn't see from existing images. In case of any missing part, please feel free to contact me and please send me a reference image that shows the part, and hence I can add and send back the updated model.
The model tried to be made as low poly as possible without breaking model screen quality and as a result, the total number of polygons (faces) is 55,784 and the total number of vertices is 57,784. This is almost a low-poly model.
All other formats (FBX, Collada, and Obj) have been exported from Blender. In case of any problem on any format, please feel free to contact me.