Several owners have given up and adapted the C No. 7 parts to work. Take the Canadianicon .22 bolthead, CAREFULLY grind it to match the Britishicon No. 7's loading platform then take a No. 4 bolt VERY CAREFULLY measure and shorten it to the necessary length(MUST have correct head space), thread it to match bolt head(3/8 X 20 IIRC) install modified bolt head and go shooting. Not recommended for someone not experienced in such things, but it does work, and if by some miracle the correct parts do show up, the rifle can easily be set to the correct BRITISH No. 7 configuration.
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