Without seeing the overall rules I can't tell for sure, but is the G/Carrier underpriced? The fusion gun alone accounts for 60% of the list price (3Mcr of 5Mcr).
Also, the original G/Carrier was supposed to be a para-military craft, not a front-line style APC. So it had less of a gun (like a VRF Gauss Gun) and was a lower TL.
Seems like the G/Carrier should be more along the lines of the original, so that true APC's would have the heavier armor, bigger gun and overall more protection to survive on the battlefield. A G/Carrier on a TL-10 world would still constitute front line equipment, but against a TL-14 or 15 force it would definitely be at a disadvantage. And if the idea is that some PC's may be running around in a G/Carrier, then you'd want true military gear to outclass and out-pew-pew them.
Also, the original G/Carrier was supposed to be a para-military craft, not a front-line style APC. So it had less of a gun (like a VRF Gauss Gun) and was a lower TL.
Seems like the G/Carrier should be more along the lines of the original, so that true APC's would have the heavier armor, bigger gun and overall more protection to survive on the battlefield. A G/Carrier on a TL-10 world would still constitute front line equipment, but against a TL-14 or 15 force it would definitely be at a disadvantage. And if the idea is that some PC's may be running around in a G/Carrier, then you'd want true military gear to outclass and out-pew-pew them.