Interesting, to me at least, is that this Daw has survived over 150 years of use with its single cylindrical bolt lock up. There is no complicated Purdey underbolt and no apparent "fitting on the circle". The semi circular cut on the underside probably mates with a transverse pin, but the major locking of the action is via the single bolt. This locking system seems to offer easy manufacture and a more shallow and graceful action. I have seen it on a Belgian Darry hammer gun. I wonder if it was used by other makers.
