In Episode 3, Joe Miller (Thomas Jane) pulls his pistol on a guy:
It appears to be substantially similar to Amos Burton’s pistol.
At the previous SDCC, prop weapons from The Expanse were on display. Here are two photos of a Star Helix pistol, possibly Miller’s:
These shots provide our best view of the pistol(s) yet. We can see that they are, in fact WE G33 Advances, and the WE logo is still visible on the grip. Scratches on the body reveal black underneath the ‘cool gray’ paint.