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The firing pin hole on my Springfield 45 acp is no longer clean an sharp around the edges. Is this primer erosion? What causes this, and what can be done to repair it?...Rofi
 

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Well, this is a challenge. I've never heard of primer erosion, but maybe we can go through the firing process and see if we can come up with something.

When the primer fires, the area surrounding the dimple made by the firing pin will be forced rearward toward the breechface by the force of the expanding gasses (recoil). This puts a strong force on the breechface area immediately surrounding the FP hole. If the edges of the hole are crisp and sharp, the vibration of repeated firings could cause the edges to chip off from metal fatigue. If you looked at a microscopic cross-secitonal view of the hole, you would not see the sharp edge that a drawing would imply, but a jagged one.

A simple analogy would be the drawing of a cliff with a straight drop, compared to the real thing. The drawing would show a horizontal line abruptly changing to a vertical line. The actual cliff, however, would not be so abrupt, but would have small dips, and peaks as it changes from the horizontal to the vertical.

The same idea applies to the FP hole, but on a microscopic scale. Just as you could stand a few feet from the edge of a cliff, and knock off pieces of the edge by repeated impacts on the ground where you are (you may need some help to do that, like a heavy pile driver), the repeated impacts of the primer against the breechface surrounding the FP hole can knock off small pieces of metal over time.

Should you be concerned? I know I wouldn't be as long as the performance of the gun doesn't change, and the brass isn't adversely affected. You didn't mention how much service the gun has had, but, unless there is something wrong with the temper of the slide, and other symptoms appear, such as cracks in the breechface, I don't see a cause for immediate concern.

I would just keep an eye on it, and go ahead and shoot it.
 

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Serious primer erosion will look like a crater in your breechface, and your gun will have some weird headspace and feeding problems. This is most often seen in high-roundcount Supers and 40s used in IPSC(Remington brass and primers were notorious for causing this). The cause is gas leaking from around the primer and actually cutting metal away. A cousin to erosion would be flame cutting of the top strap on a reolver. Most 45 APCs will never have erosion problems, but if they do, K-bear's got the right man to call.
 

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Not enough information to help you. I chamfer the firing pin hole on every gun I build to eliminate the case rim from catching on the sharp edge of the hole. I'm guessing that you don't have a problem.How many rounds through this gun. How old is it.S/A are made in Brazil and they are not very hard. Buy American!
 

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Discussion Starter #6
This springfield 45acp was new last year ,loaded model parkerized finish. I have about 2000 rounds though it of 185 JHP at a power factor of average 200. The firing pin hole in the breach is rough and has gotten bigger but other than that all is well. If the problem gets worse,Gearge @ .EGW says he can weld it for about $50.00 So I will keep an eye on it...until then happy shooting...ROFI
 

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Egw???

EGW's says at their web site they no longer do gunsmithing. Anyone know of someone else who does this type of work now? Thanks.

earlbob
 

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The firing pin hole on my Springfield 45 acp is no longer clean an sharp around the edges. Is this primer erosion? What causes this, and what can be done to repair it?...Rofi
Sounds moire like the hole was not chamfered.

Primer erosion only occurs if you are piercing primers and powder gases are blowing back against eh breech face and firing pin or are leaking between the primer and case head and cutting a nice circle into the breech face.

It usually indicates overloaded cartridges.

Chipping is more common if the hole was not chamfered slightly.



.
 

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I have a very smart talented shooter/gun builder friend who is convinced that Federal brand primers (because they are considerably softer than other brands) tend to leak gasses back against the breech face.

He had to have one of his Baers repaired. Baer drilled out the breech face and installed a bushing through which the firing pin hole was re-drilled..

I have 4 Very well used 1911s and they all show some amount of erosion.... but not around the firing pin hole.

In answer to your base question... I would ship it back to SA.... or e-mail them a picture and ask for advice. If the hole gets too ragged your FP will hang up in the hole and you'll be shipping the gun away then.
 

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I'm curious about the thought process involved in Earl's post.
Why choose a 9 year old thread about firing pins to ask about EGW gunsmithing?
:confused:
 

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I'm curious about the thought process involved in Earl's post.
Why choose a 9 year old thread about firing pins to ask about EGW gunsmithing?
:confused:
Maybe he has the same problem, and when he called EGW they said they no longer do this work.

Seems logical to me to ask the same question again!!

Live long and Prosper :rock:

Bill
 

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Discussion Starter #13
Just an FYI, I did chamfer the firing pin hole to clean up the rough edges, per Dave's suggestion and have had no issues with the hole and the feeding did improve.

Has it been nine years...:eek:

-Robert Finegan
RoFi
 

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Just an FYI, I did chamfer the firing pin hole to clean up the rough edges, per Dave's suggestion and have had no issues with the hole and the feeding did improve.

Has it been nine years...:eek:

-Robert Finegan
RoFi

Thanks Rofi,

Good stuff to know!

Bill
 

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EGW's says at their web site they no longer do gunsmithing. Anyone know of someone else who does this type of work now? Thanks.

earlbob
Has anyone got an answer for this question?? I need this work preformed on one of my pistols and don't know of any reputable gunsmiths around here.

Are there any other signs of primer erosion?? If it was caused by gasses leaking past the primer what other indicators would I see??

When I get this fixed I would like to know if it was the slide or the ammunition so I don't have to do it again.
 

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Well 9 years old I just learned something, that its not a serious problem if addressed right away.

Only gun I've ever seen do this was a .50 cal the firing pinn was too long and pierced the primer

But in general wouldn't a firing pin being too long be a more common cause? And for other people a good thing to check?
 

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Well 9 years old I just learned something, that its not a serious problem if addressed right away...

...But in general wouldn't a firing pin being too long be a more common cause? And for other people a good thing to check?
I'm not sure the primers are the cause on my Para Ordnance P-14, but I will need someone to fill in the .166" dia. crater surrounding my firing pin hole regardless of how it got there. I don't recall any burning on the breech face, nothing (carbon, powder residue, etc) inside the firing pin hole and no pierced or loose primers either. Just a nice smooth crater around the firing pin hole with some of the displaced metal being forced into said hole, then pushed back out when the firing pin strikes the next round.

I did check the Clark Custom site and they offer installation of the off-set bushings for $50, but it will cost about $100 for round-trip shipping. My next step is to call or e-mail them with a few questions. I do need to get it fixed, the gun is worthless in its current condition.

Does anyone think 3.9grs of Hodgdon Clays, PCM LP primers behind a 230gr Rainier Leadsafe FMJ would cause breech face damage?? I shot 249 rounds of this load and if memory serves I started having trouble soon after with everything else.
 

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Jim Milks who used to work at EGW has picked up their gunsmithing trade.
http://innovativecustomguns.com/gunsmithing-services/
Welding and redrilling a firing pin hole is now $75.

I cannot imagine 249 rounds of any safe load causing erosion of the breech face; you may have a soft part.

There seems to be no reason to pay gun shipping rates to just send in a slide for repair.
Thanks for the link Jim, I'll get in touch with Innovative first. If the slide is soft I would think a firing pin bushing just might sink deeper into the slide and/or work loose over time. The welding process should harden the breech face some and hopefully prevent damage in the future.

I thought the load was safe, but I'm a little new to reloading and a second opinion never hurts. It shot well, no excessive recoil, felt the same as the Speer Gold Dot and the range reloads shot the same day.

I guess I should get in touch with Para too, see if they will warranty this and what my options will be through them.
 
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