This is the Star Wars S5 Heavy Blaster that appeared in both Episode i and II
I was surprised by the lack of models and pictures available for this model.
While searching for reference material for this I did find out the original prop was made using a Feinwerkbau Model C55 airsoft pistol.
The only hardware you would need to build this are 2x M3 20mm screws to connect the bottom piece of the grip.
I modeled it like the original air soft so the bottom can slide up and down for better comfort.
If you cant get the screws I did include a model of them you can try and print.
You should be able to orient most pieces to need little to no support.
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Prusament Galaxy Black
Amazon Basics Woodfill
There was surprisingly few detailed pictures of both the airsoft gun this was made from and the actual prop.
But the one I did get I imported into fusion 360 added them as canvases and calibrated them to be able to model from them.
I was also able to find a pdf blueprint of the airsoft gun which helped immensely.