Be aware that in ERAS, some of the character models used do not have the proper animation files to carry a musket, so you will not be able to equip a musket for those characters. But, I did just check the model for Peter Blood and it does have the proper animations, but was missing from the character list the script code checks for musket capability. I added the Peter Blood model to the list and ERAS will allow that character to equip a musket in the next code update.