Ok, since they fixed the exploits in the latest patch (fitting size 3 weapons on the 300 nose, fitting gimbals on the fixed wings) it appears as though they broke the ability to swap weapons completely.

After some investigation, here is the main problem:

The 325a nose mount hardpoint is now classified as a Nose Class 2 Slot, Size 1-2, with compatible mounts of GunTurret_S1 and GunTurret_S2. On the nose mount, there is the gimbal mount which is now listed as GunTurret_S1 with a size listing of 1. This mount will not allow the installation of anything larger than a size 1 weapon, even though the hardpoint itself is still listed as size 1 and 2 compatible.

The wing hardpoints are now listed as Wing Class 1 Slot, Size 1-3, with compatible mounts of GunTurret_S1, GunTurret_S2, and GunTurret_S3. On the wing mount, there is a fixed rail mount which is listed as GunTurret_S2 with a size listing of 2. This mount will not allow the installation of a size 3 weapon, even though the wing hardpoint still lists as size 1 - 3 compatible.

Further trial and error shows that you can put the fixed rail GunTurret_S2 on the nose and equip a size 2 weapon there, but you can NOT put the GunTurret_S1 gimbal on the wing even though it is listed as compatible (due to the fact that the gimbal is class 2 and the wing hardpoint is class 1).
Judging by these facts, I do not believe that it was an intentional changing of the hard point sizes, but a simple mis-labeling error when attempting a quick fix of the exploit.

It would make much more sense to simply follow a simple cross-ship naming system when refering to gimbal and fixed mounts. It appears that this system is already in place on other ships and mounts, but just needs a quick overhaul of hardpoints assigning the proper allowances to them.

If you look as the loaner Hornet, the gimbals are listed as a Class 2b Turret. Class 2 being the classification, and the b = 2 as the size. It would make more sense to have the Class 1 weapon mounts labeled something other than turret. I would think that it would be easier to have fixed mounts labeled Class 1a Rail, gimbals to be labeled Class 2a Turret, and it appears that missile mounts are labeled as Class 3a Pylon.

I would simply ask that on the 325a (and other ships as it pertains) that the nose come with a Class 2b Turret (Class 2 Size 2 gimbal) and the wings come with a Class 1c Rail (Class 1 Size 3 fixed mount) in order to allign with the hard point allowances of the ship.

It would be nice to be able to use the weapons that some of us have paid a pretty high price through the voyager direct store, and by renaming and changing compatibility, it would also prevent any future exploiting of the mount and weapon system.