Federico from Brixia is now showing a model of a "Alla Spanola-style" or Spanish-stocked, almost Petronel-like, early matchlock arquebus, with a perp sight, as used in 1523 at the conquest of Tunis, as well as in the 2nd half of the 16th Century as used in the famous 'Battle of Pavia', shown on period tapestries!
It is a transitional stock, not as severe a curved swept stock as a true Petronel, but not really a shoulder-fired arm yet either. It will have a peep sight! They are modeling their copy of an original that is housed in the Museum of Turin.
I find this to be VERY exciting!
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