page_title: Green Mace
section_title: Other versions
hierarchical_section_title: Green Mace / Other versions
caption_attribution_description: English: An overall view of the British 1950s AA gun "Green Mace". Taken at the Royal Artillery Barracks, Woolwich.
context_page_description: Green Mace, also known as the QF 127/58 SBT X1, was a British heavy anti-aircraft gun of the 1950s. It used a variety of techniques to improve the firing rate of the gun, and the velocity of its projectiles. Although a prototype was built and survives today, it was rendered obsolete by the development of the guided surface-to-air missile and thus never entered production.
context_section_description: Some sources suggest that a naval version of Green Mace was planned as a new dual purpose gun for the Royal Navy's destroyers, and a twin version of the same gun intended for cruisers reached the design stage, but neither went any further, and they were cancelled outright in 1957.
  Original work was done on two other projects: Longhand and Ratefixer. Both were of smaller calibre than Green Mace but were designed to try and increase the rate of fire and calibre used. Similar concepts were also said to be used in the Red Queen gun, which was essentially a medium-weight version of Green Mace.
caption: The ammunition drums on the back of Green Mace, holding 14 rounds each.
exif: {"Image Make": "Canon", "Image Model": "Canon EOS 400D DIGITAL", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2015:03:21 15:35:09", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "196", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "6132", "Thumbnail JPEGInterchangeFormatLength": "8601", "EXIF ExposureTime": "1/20", "EXIF FNumber": "7/2", "EXIF ExposureProgram": "Unidentified", "EXIF ISOSpeedRatings": "400", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2015:03:21 15:35:09", "EXIF DateTimeDigitized": "2015:03:21 15:35:09", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "141621/32768", "EXIF ApertureValue": "118447/32768", "EXIF ExposureBiasValue": "0", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "18", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "3888", "EXIF ExifImageLength": "2592", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "5766", "EXIF FocalPlaneXResolution": "3888000/877", "EXIF FocalPlaneYResolution": "432000/97", "EXIF FocalPlaneResolutionUnit": "2", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard"}