It is interesting to note that the original 5" guns were anti surface only, and in the game they are listed in the naval guns section of Tracker despite being shown as AA capable in the graphic. I wonder if this was a game balancing decision or simple oversight or perhaps their original guns don't fire on planes (but it sure looks like they do from the graphic). Something isn't kosher, there.
The 5in/38 Mk12 SP EBR is a ‘Naval” Gun, Device Type 18, Slot 1627.
The are, in order:
5in/38 Mk12 OP – open pedestal, type 17 (dual purpose) slot 1622
5in/38 Mk12 OP(S) – open pedestal, single, type 17 (dual purpose) slot 1623
5in/38 Mk12 EBR – enclosed base ring, type 17 (dual purpose) slot 1624 (twin turret, BB, CA, CV, etc))
5in/38 Mk12 SEBR – enclosed base ring, single, type 17 (dual purpose) slot 1625 (single turret)
5in/38 Mk12 OBR – open base ring, type 17 (dual purpose) slot 1626 (unshielded turret type, Benson Gleaves mounts 3 & 4, etc)
5in/38 Mk12 SP EBR – single purpose enclosed base ring, type 18 (naval), slot 1627
Porter and Somers had the Mk 22 Mod 0, twin EBR mount. Very light; ~34,000 kg vs ~43,000 to 53,000 kg for the Mk 38 and Mk 32 mounts, respectively, on the Sumner/Gearing DDs and CV/CA/CLs, again respectively.
Elevation: -15/+85 degrees, Twin Mounts Mk 28, Mk 29, Mk 32, Mk 38 (all except Mk 22)
Elevation: -10/+35 degrees, Twin Mount Mk 22
Elevation Rate: 15 degrees per second, Mk 28, 29, 32, 38
Elevation Rate: 11.5 degrees per second, Mk 22
Train Rate: 25 degrees per second, Mk 28, 29, 32, 38
Train Rate: 14.7 degrees per second, Mk 22
The Mk 22 was an excellent naval mount. Its lower mass (moment of inertia) combined with adapted gun trunion placement, allowed for the greater slew rate horizontally, and vertically, given the same actuator motor HP.
Should be noted that the Porter/Somers series were the only vessels that got these mounts. Not sure what your tracker thing is showing, but the database has them tagged and typed as described, above. Matt