Carrier Comp just called me and I explained to them that this follower was going into a 1301 and they were happy to hear it. She noted that it has been all of a sudden they have started selling followers and right before me she had talked to another guy who was putting their m4 follower into a 1301.
I told her about this thread and she was really pleased and asked that if we have feedback on this follower working in 1301s, to let them know and she would be passing the info along to her husband about the fitment in the Beretta guns.