Butlerford had part of the answer. Colt failed with the Patterson, and closed the New Jersey facility in about 1842. When Captain Sam Walker, who had used Pattersons with the Texas Rangers approached Sam Colt about a new revolver, Colt had no manufacturing facilities of his own. They went to Eli Whitney for the manufacture, with the contract that the tooling made to produce the revolver should then go to Colt. This produced the 1847 Whitneyville/Walker Colt 1847. When Colt opened shop in Connecticut, with Whitney made tooling, he had redesigned the Walker due to weight and blow-ups, to the 1st model Dragoon of 1848. The Whitney/Colt Dragoon was made with many left over Walker parts, as can be seen in the shape of the top of the wood grips on the very first Dragoons. Subsequent 2nd and 3rd Model Dragoons were of new manufacture in the Hartford Colt plant.