I have a video by a Nihon Goshin group from that area, entitled "Dynamic Aikido combat." It's definitley a very direct, hard style, with tough looking ukemi! They did this gun takeaway section in the video, and I'll just say that I felt bad for the sensei's uke! Very tough shihonage's and kotegaeishi's, as well as this sankyo variant from a gun takeaway where I though the poor uke's fingers were going to get ripped out.
Anyway, that's my only exposure. Good luck, and if they are doing gun takeaways, errr, you might want to sit that one out.