Ditto
Ive not seen it but spoke many times with the guy, and a couple of times on the subject
One of his weird but functional ideas is below
Its a tiny bullpup style design. Too small and tight for my big arms and hands, but with the bottle angled on a kickup Mount, instead of jerky moves to adjust, you tuck it into your shoulder and ‘roll’ to chase your target
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Stick it under the barrel - plenty of space there!
Of course I only did this a handful of times, just because I could, not very practical, aim high as it pulls down the tip
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