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Talk:GIAT M693
What came first?
Does anybody know what cannon came first, the GIAT M621 or the GIAT M639? The number would suggest the M621, however most of the stuff I have been able to find suggests that the M621 was developed as a lightweight, low recoil version for mounting on helicopters and smaller ships. --commando552 (talk) 05:09, 28 September 2013 (EDT)