The Ithaca NID series has the firing pin integral with the forged hammer, as does the Fox and Parker and the Model 21. The NID is a very stout action- John Olin didn't "upsize" his fledgling M21 to handle a 3.5" 10 magnum shell in 1932-33- he went to friend Lou Smith at Ithaca and they designed a NID beefed up for that "Roman Candle" shell- I have a hunting pal with a 1938 era 12 NID Grade 3E- 28" M&F, DT- and I am first in line if he ever decides to sell it- not likely- darn fine boxlock doubles, IMO!!
