Thingiverse
This is the Alien Blaster from Fallout 3 (specifically from the Mothership Zeta add-on).The included .blend file lets you adjust things like the polygon density and the model's wall thickness. So, if you want to, say, make the grip hollow to save resin or fit electronics, you can easily do that.
Direct link to the original creator's page
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Thangs
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Cults3D
Printables
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Click the "View on Thingiverse" button above to visit the original model page on Thingiverse. You can download the STL file directly from the creator's page for free.
This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, this model is available as a free download on Thingiverse. Some creators accept tips or donations.
Check the license (see original page) on the original Thingiverse page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.