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Manufactured by Heckler & Koch, this kit allowed the L1A1 and C1A1 battle rifles (the FN FAL in British and Canadian service) to be quickly and reversibly converted to .22 calibre for training purposes. One of the most reliable drop-in .22 conversion kits ever produced, the L12A1 was used by the UK and Canada from the 1970s until the 1980s when the L1A1 and C1A1 were retired.

SOURCES:
https://www.rifleman.org.uk/FN_Self_Loading_Rifle_L1A1.html
https://www.sturmgewehr.com/forums/index.php?/topic/23839-wts-fn-fal-hk-22-conversion-kit/
https://smallarmsreview.com/l12a1-conversion-kit-british-22-rimfire-fal/