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The article starts off with the Yak is a 12.7×108mm caliber, which I don't think is right regardless of whether the calibre refers to the barrel length or the bore. Later on it says the gun was replaced by "the smaller caliber but swivel-mounted GSh-23L" which is a 23mm cannon, twice the diameter of the YakB. 96.241.177.111 ( talk) 23:21, 23 January 2019 (UTC) reply