If you are the law, you need to show you are the law.
For display on a desk or shelf, I present the lawgiver from the 2012 movie Dredd.
The entire weapon is only approximately 7 inches long. (Way smaller than the movie prop, but big enough to be mistaken, don't do anything stupid). The special ammo magazine is removable and an insert can be put in its place to cover boy variants of this gun shown in the movie. With the magazine on you can either lock the handle into its slot and display at a raised angle, or allow it to stand up on its own on the display. With the insert in place you use the t_bar on the stand to support it. The Badge sits in its own slot at an angle.
*This is a toy, don't do anything stupid with it.
Printer:
Hatchbox Alpha/Flash Forge Creator Pro
Rafts:
Doesn't Matter
Supports:
No
Resolution:
200 Microns
Infill:
20%
Notes:
I printed the whole thing without any supports, but I have excellent active cooling, even then the muzzle vents are a bit rough, so you might need supports. I also used a raft with the barrel but that is because of my delta printer, not the model.
Print 2 of the ammo piece
Glue the two body pieces together
place an ammo piece in each side of the magazine part
Glue the magazine parts together
Place the magazine or the insert into the space on the body (you might have to sand some for the insert)
Place the t-stand in the base
Place the badge in its slot
place the gun on the display.
I found several pictures from the movie of this gun and modeled it in Fusion 360