I just picked up a F. Robbings shotgun of New York. It is about a 15 ga. (.677 id.)percussion double. It is all there and there and covered with a moderate amount of rust. It has never been messed up by over cleaning and all that. I worked on the bores and they seem fine but about a hand ful of rust and dirt came out so far. Does anyone out there have any info on this shotgun. I will take some pictures this evening and post. A new squirrel season in Virginia is going to open in early June and I can't wait to get started.