>>5497616My guess is the Mars Pattern Bolters are designed primarily for Mass Production. The standard models universal to space marines everywhere.
Lucian Pattern Bolters are Artisan and Master-crafted things, since Lucius is the Artisan planet. Less Salamander beauty and gem encrusted, more optimized to hell and back. As close to getting Mechanicum bolters without being in the Mechanicum. Customizable, modular, high quality materials.
Forge Bolters with built in cogitator targeting.
Shoulder mounted Maxim Bolters
Cognis munitions and rounds of every flavor. Possibly even having reverse engineered a few archaotech bullets to replace conventional HE with Federation Micro-Atomics.
Really high quality stuff that we first horde for ourselves, and then sell the remaining surplus to everyone else. And even then they are lucky with the supply of bolters because normally we just don't use them and prefer Volkite as our standard arms instead. Even our surplus weapons are artisan.
Roboute, being Roboute, would like to get some of the good quality stuff for his precious Ultramarines so he goes directly to the source.