A couple of questions that have arisen in my current game.

Does a PC add his strength bonus to the damage of the attachment when it hits?

Can the same attachment be used with a Charge action, it says it can be used if you spend a half action or a reaction to make a standard attack, because a charge action is a full action, i don't think it can be used as the attacking weapon in a charge, can anyone clarify?

Thanks in advance to anyone who can help