if you have 1 friend you can just spam the same request to that person and it will count. However they will most likely un-friend you for spam lol

Well not exactly, although the FB gun has a higher clip it has exactly the same ROF and bullet stats. The freeze is identical also, so in a 1v1 in a small area a PM would destroy a FB. Plus if the FB actually cost money I would personally rank it for value, which would be like 30-45k, considering it's the only gun currently that beholds full Knockback power, making its value 1up.
p.s. both guns blow