QF 12.7 cm/38 calibre Mk XXIII gun
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| QF 12.7 cm/38 calibre Mk XXIII gun 12,7 cm SfK C/42 | |
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 Two twin Mk 44 mounts installed on HMS Hecate (FBB-59) | |
| Type | Naval gun |
| Place of origin | Illusia and Neverendia |
| Service history | |
| In service | 2047–present |
| Used by | Illusia and Neverendia |
| Wars | Memesterian Civil War |
| Production history | |
| Designed | 2042 |
| Produced | 2045–present |
| Specifications | |
| Weight | Gun assembly: 1,810 kg (3,990 lb) Mounts varied from 13,300 kg (29,300 lb) to 77,350 kg (170,530 lb) |
| Barrel length | 4.826 m (15 ft 10.0 in) (38 calibres) |
| Crew | Varies per mount type |
| Shell | 127×680mmR 24 to 25 kg (53 to 55 lb) |
| Calibre | 127 mm (5.0 in) |
| Breech | Vertical sliding-wedge |
| Recoil | 38 cm (15 in) |
| Elevation | −15° to +85° |
| Traverse | 328.5 degrees |
| Rate of fire | Design: 18 rpm Actual: 15 rpm |
| Sights | Digital fire control system Optical telescope (backup) |
The QF 12.7 cm/38 calibre Mk XXIII gun is an Illuverendian naval gun that is extensively deployed on a large majority of Royal Illuverendian Navy surface vessels. For the unrelated lightweight gun yet also employed by the Royal Illuverendian Navy, see 127 mm/62 calibre Mk LXVI naval gun.
This variant of a 127 mm artillery was conceived by the ailing Stratocracy, with the Royal Illuverendian Navy getting hold of later use after Alyssa took power. Due to the limitations employed by the modern lightweight 127 mm gun, the Navy's research and development teams went back with the "traditional" way of making a short-barreled, quick-firing gun that would also project the same effectiveness on the modern lightweight guns. Paired with a widespread apathetic opinion on the slow-firing antiquated 15 cm SK C/29 guns, the Mk 23 gun had no opposition in being quickly implemented, starting with the S-51 project, those being the Albemarle class of battleships, the Revenge class of cruisers, and eventually the New Generation Fast Battleships.