Lead Moderator European Armoury
Join Date: Dec 2004
Hola Cavalco. Welcome to the forum.
I guess it all depends on the period dimensions of the arcabuz or musket . Probably the ones that needed the rest (fork) came first and were rather long and heavy. Later versions, like the 'caliver', didn't need support.
I have just posted a picture of an arcabucero of the period of King Felipe II of Spain and apparently this style was already light enough to support without a fork.
I hope Michael (Matchlock) comes around to give you a full and competent information on this subject.