Recently purchased a Colt New Service s/n 171xxx which makes the frame a 1917 product. However, the barrel shows a 1926 patent date. It is a .44 special (marked "NEW SERVICE .44" with a 5 1/4inch barrel. adjustable rear sight and gold bead front sight. I realize its a "parts gun" and I bought it as a shooter. Problem: a broken firing pin on the skeletonized hammer (see THE HANDGUN by Boothroyd, 1970, page 309 for photo for hammer). I have checked Numrich for a replacement but no luck. Suggestions/Comments will be appreciated. Thanks.