.45 Pistols never was a weapon. It becomes the only Attachment. Item. Weapon. It does not appear in ye olde Official Rules Clarifications and Frequently Asked Questions (F.A.Q. 2.0). So this is a new development, an all new (albeit subtly different) card. The seventh unique to core card, by my count.
It is the first zero cost neutral weapon. Free combat for everyone. In pace and deck slots and attachment-ness it is still exorbidant and not free.