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Those revolvers that departed most radically from the original Bull Dog concept were undoubtedly the models manufactured in the United States with the purpose of introducing a more patriotic version for the domestic market.

Early entrants to the scene with a revised design were the gunmakers Iver Johnson & Martin Bye of Worcester, Massachusetts, where the first American version was produced. It differed mainly from its British counterpart in not being provided with a swivel case ejector but, instead, having a quickly removable cylinder to make ejection and loading more convenient. A large-diameter extension of the cylinder spindle had been cross-knurled for this purpose. The method used was virtually identical to that employed on the earlier spur trigger model and most other American pocket revolvers at that time.

A further change also occurred in the lock mechanism with an elimination of the Webley double-limb mainspring and its replacement by a single-leaf component. In other respects, the double-action lock arrangement was much the same as on the Webley Bull Dog with the exception of pins, rather than screws, being used for the trigger and sear pivots. The latter item also served to retain the trigger guard. Although the guard itself still remained as a separate unit from the frame, it had been extended to form the front grip strap and was held at its base to the butt. Stock plates were of hardened rubber with a chequered pattern.