Frank Iannamico Posted June 20, 2019 Report Share Posted June 20, 2019 I had reported in an earlier thread about my 4th firing pin failure, so I decided to make a new pin using the boss of an original pin and silver soldering part of a (similar) BAR pin to it. I went to visit a gunsmith/C2 mfg friend some of you may know, Tony Veronesi. I told him of my plan. He said it would be better to make a new one out of a piece of bar stock. He said the problem with the pins (in his opinion) the original and aftermarket pins have the capability to extend too far out of the bolt face, possibly through inertia. SO he made me a pin that CANNOT extend past .045" out of the bolt face. We shot a hundred rounds just to make sure it worked. I also bought a titanium pin but an inquiry of their reliability varied so I'll try Tony's pin, I'll keep you posted. Link to comment Share on other sites More sharing options...
Bridgeport28A1 Posted June 20, 2019 Report Share Posted June 20, 2019 Frank, was the firing pin heat treated at all after machining or simply turned down from drill rod stock ? Link to comment Share on other sites More sharing options...
Frank Iannamico Posted June 20, 2019 Author Report Share Posted June 20, 2019 Yes, Firing pin was heat treated. Link to comment Share on other sites More sharing options...
jl7422 Posted June 20, 2019 Report Share Posted June 20, 2019 If it works and lasts maybe he'd consider doing a small run of that design. . . Link to comment Share on other sites More sharing options...
Frank Iannamico Posted June 21, 2019 Author Report Share Posted June 21, 2019 Maybe, but I need to test it long-term Link to comment Share on other sites More sharing options...
johnsonlmg41 Posted June 22, 2019 Report Share Posted June 22, 2019 Often firing pin breakage is just a symptom of other problems and diving deeper is necessary to fix the actual problem. Most guys just keep putting in new pins with the same eventual result, then at some point followed by a sale. Link to comment Share on other sites More sharing options...
n64atlas Posted June 24, 2019 Report Share Posted June 24, 2019 I just measured the 5 firing pins I had handy. Each was a different length and tip diameter.I will get pics and true measurmentss when I get a chance. Link to comment Share on other sites More sharing options...
StrangeRanger Posted June 25, 2019 Report Share Posted June 25, 2019 My "good" factory firing pin: 4.045" OAL, .082" dia. at tipMy "spare" factory firing pin: 4.048" OAL, .085" dia. at tipMy Keystone firing pin: 4.047" OAL, .083" dia. straight section at tip Link to comment Share on other sites More sharing options...
n64atlas Posted June 26, 2019 Report Share Posted June 26, 2019 (edited) Six pins. One is titanium (the one in the white). All are a little different. At least one original and a couple are keystone.The original has the beveled retaining pin slot. I would measure but I can't find my good calipers Edited June 26, 2019 by n64atlas Link to comment Share on other sites More sharing options...
StrangeRanger Posted June 26, 2019 Report Share Posted June 26, 2019 Keystone has changed their pin design since you bought yours. Instead of a taper, it's now a more conventional stepped design Link to comment Share on other sites More sharing options...
Frank Iannamico Posted June 26, 2019 Author Report Share Posted June 26, 2019 Keystone has changed their pin design since you bought yours. Instead of a taper, it's now a more conventional stepped design IMG_20190626_123329628.jpgThat is the kind I bought from Joe, any experience on the life of this design?The one I had made has a longer "collar" and the pin is shorter making it impossible to extend any further than .045". Seeing how the "inertia" pin concept works, perhaps that is causing pins that extend too far and break. If you have not seen the inertia idea it's on this site. http://www.machinegu...?showtopic=8854 Link to comment Share on other sites More sharing options...
StrangeRanger Posted June 26, 2019 Report Share Posted June 26, 2019 Not enough mileage on my Keystone pin yet to render a verdict but I can see two advantages to the stepped design: Better control of the pin diameter where it fits the hole in the bolt face Much easier to manufacture and inspect.I haven't converted my gun to a floating firing pin yet, I'm trusting in my Wolff spring kit to prevent the cartridge/pin jams. So far it has done so. Link to comment Share on other sites More sharing options...
PilotDave Posted November 9, 2020 Report Share Posted November 9, 2020 I need firing pins if anyone makes a batch or has one extra thanks Link to comment Share on other sites More sharing options...
huggytree Posted November 10, 2020 Report Share Posted November 10, 2020 Mine kept breaking pins until I switched to a floating pin. I even broke titanium ones. Im at 1500+ rounds without any firing pin issues Link to comment Share on other sites More sharing options...
Ryo Posted November 18, 2020 Report Share Posted November 18, 2020 Yeah.. Paul's inertia firing pin mod works great. Link to comment Share on other sites More sharing options...
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