New Firing Pin this time.

[Dave Hoback]

Since I now KNOW those 22lb flat springs will work, I’m going to try a 20lb. But while thinking about it I started wondering what else I could do. How about a better firing pin? Little heavier, to deliver more force. Got into my knowledge of steels & decided S7 tool steel would be perfect. It’s a highly shock resistant air hardening steel & is very resistant to heat.

Quickly had a piece of 1/4” S7 here & cut to slightly longer than my stock FP.



So the stock firing pin, the turned down porting through the cross pin is quite a a bit thinner diameter. Yet I found the Bolt head will accept up to a #25 drill bit(.149”). Turned the S7 down just a bit less for clearance.
And I thought why not make a new cross pin from the Titanium I have? So I did. Center Drilled to fit the new threaded S7 pin nicely & next to stock pin. I’ll finish the striker portion & flats at the very end. After I heat treat the pin. The pin is carrying a bit more weight & coupled with the increased FALL I added, even with the 20lb spring, it should work nicely. More to come!


And complete firing pin assembly. I darkened it by dipping in Ferric Chloride.

[Dave Hoback]

Cut the threads & put the flats in. The stock FP weighs 259.7 Grains & the new FP weighs 312.5 Grains, or 16.8 & 20.2 Grams respectively.

[celltech]

Very cool looking project, put that pin tip looks huge. Will that cause a problem with primer ignition?

[Dave Hoback]

Very cool looking project, put that pin tip looks huge. Will that cause a problem with primer ignition?

Thanks. It is quite amazing what a bench vise & small box with some GO/NoGo gauges can accomplish.

You are correct. I won’t turn down the tip until after I heat treat.

[Robinhood]

Is there something missing?

[Dave Hoback]

Is there something missing?

??

[mnbogboy2]

Nice job dave. I am thinking about building another firing pin spring compressor and researched b7 threaded rod to use for the main compression mechanism.