Here's Bob Roller's opinion on the Hawken Shop kit.
The stamping on the top of the pistol barrel is J&S Hawkens with a "s". I have an article coming out in the October Muzzle Blasts on this particular pistol. I am in agreement with Jim Gordon and Hanson that the "s" added to the name of Hawken is good reason to believe that the pistol, in its original flintlock configuration, is of eastern or European origin and not manufactured by the original Hawken shop in St. Louis BUT only sold through the Hawken shop.
The price of THE HAWKEN SHOP kit is $1400 and the quality of the parts and work done on them is worth it. The breech is made of #8620, X-rayed and fit to the barrel properly. The Rice barrel with a 1:48 twist has been stamped S. HAWKEN ST. LOUIS in the proper spot and dovetails have been cut for the front and rear sights and underlugs for the barrel keys, again in the proper spot. The lock on a T. Gibbons lock plate is finished, as are the double-set triggers. The underib has the 4 holes drilled and into the barrel, and the position of the two thimbles is positioned properly. All holes on the breech plug tang are dilled and countersunk and the 2 holes on the trigger bar for the tang screws have been positioned properly. The 2 holes on the buttplate and toeplate are also positioned properly, drilled and countersunk. The kit has the parts and instruction for making an original Hawken-style ramrod of hickory. With each and every component part of the kit is a sealed bag with the proper bolts or screws, PLUS and extra set. In other words, a lot of time and thought has gone into offering the component parts, so that you can assemble them in the proper place WITHOUT MAKING ANY MISTAKES. Time is money. Mistakes waste time. The final product is as close to as you can get to a late-period S. Hawken rifle.