Dorr N. Wiltse, Jr. & I wrote the book Michigan Gunsmiths from the 18th through the early 20th Centuries. We have seen many Michigan rifles with barrels stamed REMINGTON, or some variation there of. I believe they also supplied, if not made, percussion locks. We saw one brass capbox with "REMINGTON" stamped inside the lid. Whether Remington made brass mounts or just supplied them to gunmakers I do not know.