Break Action shotgun modelled by me, based on many real examples, but In the end a original design. First 3d model that Ive ever done and to have also made compatible with clip.
The "Action" is modelled so that the gun can open for reloading.
If the model doesnt seem to appear, zoom out, it is a very big model scale wise.
You can adjust the scale by going into the model settings, clicking allocate, and moving the "Object Scale" slider.

Material
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Default material
Allocate
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Default layout
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Open to Reload