@losticmate:
7 hours of waiting , that's not reasonnable !
What tool did you use ? Perhaps you put too much hight settings ? You could do a fastest bake on blender that patin on top of it if needed perhaps ?
Even for complete high scenes, there are fast renderers today !
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Your rifle is really good , ready for game
For the gun, the sort of little knife in the front , i find it
bad placed if it it designed to a closed hand attack with it !
Make it more efficient , put it under the canon part, it will be more realistic in terms of usage
Like the accessory at the bottom line on the picture :