A variant of the Speargun wielded by Feral Predator, the Bolt Gun had guided bolts that sought out their target via the use of the bio-mask's targeting laser system, not unlike a Plasmacaster.
Complete design and divided into pieces.
To join the pieces you can use three sections (about 200 mm) of 3 mm diameter rods.
It can be printed at actual size on a standard format printer like an Ender 3.