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.
For the wall brackets I used the picture hanging strips that you can peel away
Most parts should be support free.
Assembly Video
The author marked this model as their own original creation.