Vickers .50 Mark 3
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| Gun crew maintaining Vickers machinegun on board Isaac Sweers. |
| Gun specs | ||
| Gun type | Vickers watercooled Mark 3 machine gun | |
| Purpose | Light AA-defence | |
| Bore | .50 calibre (12,7 mm) | |
| Classes used on | Isaac Sweers | |
| Date of design | Origin dates back from early World War I | |
| Date in service | 1941 (Isaac Sweers) | |
| Length | 62 calibers (1,32 m) | |
| Gunweight | 28,1 kg (max) | |
| Initial velocity | 2520 feet/sec | |
| Rate of fire | 700 rounds/minute per gun | |
| Cooling | Watercooled | |
| Shell specs | ||
| Shell types | Non-explosive bullets | |
| Shell weight | 8 grams | |
| Effective range | 732 m | |
| Range | 1350 m @ 0 degrees | |
| 914 m @ 80 degrees | ||
| Mount specs | ||
| Mount type | Mark III Quad mount | |
| Mount armor | - | |
| Mount weight | 1,3 tons | |
| Elevation | -10 / + 80 degrees | |
| Train | continuous 360 degrees | |
| Train method | manual | |
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