Filipe, what a treatise !!!
Definitely your luggage of these things scares me off discussion.
Still, the only experience i have in this particular, is an article (where i was most kindly appointed co-author) on the Westley-Richards (Monkey tail) pistols, of which i had a couple at the time; a version that ended up being only produced for a Portuguese contract (1000 units). Incidentally their failure to be accepted by the British Board of Ordnance was not a gas leakage issue, described the Board as "absolutely gas tight", but their non military advantage.
Back to early artillery, i dare realize that those Orban/Munir Ali guys were smart enough to circumvent problematic solutions like those applied to Berços, for one ( direct plug into barrel and quarter turn rotation), or any other pivoting systems. A screwing principle; not just a quarter or half turn method but, the whole of four threads rotation. This prevented their minds to predict the advent of the gasket or the washer. And adding to the fact, according to the Brits that, the threads were impeccable, i wander if even Lucifer could escape through them. This still not excluding some lubricating/sealing resource, like organic grease.
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