ASSRA Forum - Highway Breach Block Firing Pin Hole Burr

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Highway Breach Block Firing Pin Hole Burr (Read 544 times)

n.r.davis Oldtimer Offline Posts: 578 Joined: Dec 3^rd, 2015	Highway Breach Block Firing Pin Hole Burr May 16^th, 2023 at 9:07am	Print Post
	Seems like all the Breach Blocks have a Burr or slight Buldge around the Firing Pin Hole. From what I can figure out the travel of the F.P. is haulted by the Radius merging the Nose to the Body. Over the years the constant pounding swedges the metal forward. What to do? Dress it down, new Breach Block or is it the Nature of the Beast. Thanks, David


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beltfed Frequent Elocutionist Offline Posts: 1751 Location: Central Wi Joined: Dec 20^th, 2007	Re: Highway Breach Block Firing Pin Hole Burr Reply #1 - May 16^th, 2023 at 9:23am	Print Post
	I would say to remove the burr by stoning or filing to restore the face of the breechblock to "flatness" up to the firing pin hole. If the burr persists/comes back, the breechblock should be bushed with a harder material beltfed/arnie


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Chuckster Frequent Elocutionist Offline Posts: 2229 Location: Colorado Joined: May 15^th, 2008	Re: Highway Breach Block Firing Pin Hole Burr Reply #2 - May 16^th, 2023 at 11:59am	Print Post
	Always thought the hammer should rest on the frame or receiver when down, not on the firing pin. Base of the firing pin should just touch the hammer when down with the correct protrusion of the tip. Front shoulder of the firing pin should be clear when the hammer is down. Contact, if any, just from inertia. Similar with firing pin retaining pins or screws, clear when the hammer is down. Chuck


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bobw Frequent Elocutionist Offline Posts: 1447 Location: NW, Iowa Joined: Mar 19^th, 2013	Re: Highway Breach Block Firing Pin Hole Burr Reply #3 - May 16^th, 2023 at 12:15pm	Print Post
	What Chuck says is how I setup firing pins. In theory when the hammer is down the firing pin is floating free, no contact of the pin body at the front, rear or retaining screw. Guess I figure there is some dampening of the pin as it strikes the primer. Now dry firing is a different problem if continually done. Bob

	Robert Warren
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