Thread: Stirling Model 20 .22LR rifle - maximise buyback price.

Originally Posted by Cordite

Mark told me the tool steel is better steel than the steel used for the original firing pins (hence them breaking).

It may well be that these unhardened tool steel firing pins will outdo the originals. Especially, as you will note from the photo, since he has properly radiused the weak spot on the inside corner to spread stress. I guess this is the common break point of the factory ones.

From other dealings I've had with Mark he's the type of engineer who'll only turn out the best or not at all, and his recommendation was that for long term use he'd harden the firing pin.

Yes, Mark would not even let a part go out the door he thought might come back broken, even if its sole purpose is to be crushed.