ASSRA Forum - Firing pin shape, protrusion for 22RF

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Firing pin shape, protrusion for 22RF (Read 2132 times)

rgchristensen Frequent Elocutionist Offline Posts: 1139 Joined: Jan 2^nd, 2014	Firing pin shape, protrusion for 22RF Mar 11^th, 2018 at 11:46am	Print Post
	What do you like for a firing pin shape and protrusion for 22RF? I'm starting from scratch, here, and am thinking a rounded wedge shape with about 0.025" protrusion. Is that close to a good way to go? CHRIS RGChristensen


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WillH Junior Member Offline Posts: 76 Joined: May 20^th, 2013	Re: Firing pin shape, protrusion for 22RF Reply #1 - Mar 11^th, 2018 at 12:23pm	Print Post
	Tool steel; round if application permits; sized to fit the hole; flat face w radius corners; length, fully retracted, flush with breach block/bolt face; full extension, just short of contact w barrel on empty chamber; .040 +/- Will


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uscra112 Frequent Elocutionist Offline Posts: 4079 Location: Switzerland of Ohio Joined: May 7^th, 2007	Re: Firing pin shape, protrusion for 22RF Reply #2 - Mar 11^th, 2018 at 2:32pm	Print Post
	WillH wrote on Mar 11^th, 2018 at 12:23pm: Tool steel; round if application permits; sized to fit the hole; flat face w radius corners; length, fully retracted, flush with breach block/bolt face; full extension, just short of contact w barrel on empty chamber; .040 +/- Will EXACTLY. .025" protrusion will not be enough.

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John Taylor Frequent Elocutionist Offline Posts: 1755 Location: Lewiston, ID Joined: Oct 23^rd, 2006	Re: Firing pin shape, protrusion for 22RF Reply #3 - Mar 11^th, 2018 at 4:08pm	Print Post
	sometimes the shape of the firing pin for a 22LR is directly proportional to the hammer blow. If you have a light strike then you will need a narrow firing pin tip, a heavy blow and you can use a round tip about 1/8" diameter. I usually try for .035" protrusion. The rim on a 22 is .043" thick so even .020" would most likely set off a cartridge.

	John Taylor Machinist/gunsmith
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Chuckster Frequent Elocutionist Offline Posts: 2254 Location: Colorado Joined: May 15^th, 2008	Re: Firing pin shape, protrusion for 22RF Reply #4 - Mar 12^th, 2018 at 10:41pm	Print Post
	Wow, we ask for advice and we get it from experience plus the rationale behind the advice. John, Thank you. Chuck


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JerryH Frequent Elocutionist Offline ASSRA Member #10876 Posts: 1262 Location: Easton, CA Joined: Nov 9^th, 2014	Re: Firing pin shape, protrusion for 22RF Reply #5 - Mar 12^th, 2018 at 11:18pm	Print Post
	Many Thanks from me also John. I'm just about ready to start on a 22RF Ballard project and this information couldn't have come along at a better time. JerryH

	I'm not a complete idiot, some of my parts are missing.
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Schuetzendave Frequent Elocutionist Offline Retired Ex-Shooter Posts: 4107 Location: St. Albert, Alberta Joined: Jan 28^th, 2005	Re: Firing pin shape, protrusion for 22RF Reply #6 - Mar 13^th, 2018 at 7:20am	Print Post
	With a heavier hammer spring in my CPA I indent the rimfire edge quite aggressively but without cracking it or rupturing it. Question is when is there too much protrusion? Does a sharper and quicker ignition of a rimfire affect accuracy? Have not tested it off the bench since I use it for offhand practice.


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