It looks to me that it is something somebody has put together from "scratch" - not a kit gun. I've never seen a "kit gun" with an L & R lock but I could be wrong. If you need parts to complete it - go to Track of The Wolf (google it). They'll have what you need including L & R lock parts.
If a pair of '51 Navies were good enough for Billy Hickok, then a single Navy on my right hip is good enough for me . . . besides . . . I'm probably only half as good as he was anyways. Hiram's Rangers Badge #63