I realize this is an old subject, but stumbling across it and having some knowledge of the matter, decided to reply. According to the former Historical Director for the Park Service at the Castillo in St. Augustine, the correct military musket for the Spanish colonial period is represented by The Rifle Shoppe's Spanish Light Military Escopeta (776.) These are provided by The Rifle Shoppe in unfinished kit form for about $1,000, but I believe they will assemble and finish one for you for about $2,000. According to The Rifle Shoppe's historical description for this musket in their online catalogue, these were used for a long period and have been found in numerous locations across North America. In the office for the Park Service they had two of these Rifle Shoppe kits which had been assembled and finished for $2,000 each by (I believe) a gentleman in New Jersey, who had subsequently died. The Park Service manager there bemoaned the fact that they had been unable to procure more of these (and also the $2K each price!) So given the situation, the reenactors were given reasonable latitude in the muskets they used, which they provided at their own expense. I believe most of them used English muskets. I told the manager I believed I could provide them correct Spanish muskets built from Rifle Shoppe parts, albeit at a slow rate, and about 6 months later in summer of 2014 drove there from Maryland with an assembled and finished sample (which would cost, you guessed it, just under $2K.) I don't know if the reenactor turnout that day was abnormally light as a random occurrence or if there were other factors involved, but the few folks present commented how much they liked it, etc. but no one seemed interested in paying that much for one, which is totally understandable.