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- The breech blocks of the two 9.2 inch guns have been replaced with newly manufactured ones.
- The breech block housed a diagonally downward-sloping firing pin which was struck with a front-action side-mounted hammer.
- Thirty-eight guns were abandoned, most having their breech blocks removed and sights disabled by the gunners first.
- Downward-opening Welin breech blocks and Smith-Asbury mechanisms were used on both Mark 4 and Mark 6 types.
- The breech block and small muzzle brake.