This may be planned for a future supplement (I hope so), but there have been some worried of only generic weapons being provided. The customization system can easily model some of the iconic weapons by adding differentiation, I hope this is what is planned.
The customization system allows many adjustments using attachments and modding of attachments with mechanic skill to be made to weapons and armor. There are some basic attachments in the core book. I'm assuming some more will be added in an expansion. Since a player mechanic can mod attachments, a weapons factory making the weapon itself should be able to easily add attachments or even mod them before sell.
Here are some examples of what I mean. I'm using the old WotC Arms and Equipment Guide as a source:
DL-18 Blaster Pistol: The basic Blaster Pistol. Cr 500. 3 Hard Points remaining.
DL-22 Blaster Pistol: A Blaster Pistol with a the Blaster Actuating Module attached (not modded) giving +1 damage but adding a Setback die. Stun ability removed. 2 Hard Points remaining. Cr 500.
DL-44 Heavy Blaster: The basic Heavy Blaster Pistol. 3 Hard Points remaining. Cr 750.
SoroSuub Model K-3: Heavy Blaster with Blaster Actuating Module (not modded) +1 damage and Telescopic Optial Sight (not modded) -1 difficulty Long/Extreme 1 Hard Point remaining. Cr 1100.
BlasTech E11: Blaster Carbine with Folding Stock. Encumbrance 2. 2 Hard Points remaining. Cr 1000.
I used costs of attachments at 1/2 price since they were added at the factory. These attachments are permanent with the weapon though. They can not be modded afterwards (if not already at the factory) or removed without destroying them. Thus, the Mechanic's mod ability is not made obsolete and a player can not circumvent the cost of attachments by buying a weapon with a 1/2 price attachment then modding it. Factory weapons still may have remaining hard points for further modification. So the factory weapons are overall cheaper, but a skilled mechanic may still use his skills to make something better and exactly to his liking, at an added cost.
When making the examples above, I assumed that removing the Stun ability from a weapon saves Cr 250. I created the Folding Stock attachment for Carbines and Rifles only which uses 2 Hard Points, costs Cr 250, and reduces Encumbrance by 1.