Of course it is possible. It's also quite easy.
1. Get the X3 Editor 2 which is availabe from here:
http://x3e2.doubleshadow.wz.cz/
2. Use the Cat-manager included in the X3Editor 2 and open the cat files with it. You need to look for a folder named 'types' and a file named 'TCockpits.pck' in the types-folder.
At first, you should look for it in the activated-mod catalogue (inside the 'mods'-folder), and if you have none or it doesn't contain a TCockpits.pck, then you should try and look for it in the .cat-files in the main X3TC-directory.
There you need to begin your search inside the .cat-file with the highest number, which should be 13.cat in vanilla game. If this catalogue doesn't contain a TCockpits.pck, then look inside the next number (so that would be 12.cat).
Continue your search until you have found a TCockpits.pck, and open this file.
3. When you have opened the TCockpits, you need to look for the entry 'SS_COCKPIT_S_UPDO_M2'. Click on it to show up the list of compatible and available guns. Compatible guns are those guns you can install inside the corresponding turret, and available guns cannot be installed inside that turret.
Double-click a weapon from 'available guns' to add it to the 'compatible guns'-list, so to add it to that turret, and then save the file.
After that, your Python should be ready
mfg
Striker
