4 model

Free

Ballista Gravis smoothbore gun barrel

Cults3D

Free

Prusa i3 Y-Corners SmoothBar 10mm

Thingiverse

Free

Smoothbore Ender & CR10 Filament Extruder Block with Threaded Coupler and Nut

Thingiverse

Free

Salt Strike barrel variants

Printables