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Discussion Starter · #1 ·
I took apart my PC carbine for a quick clean today and noticed some small deformation at the corner of the bolt. It doesn't seem to be too bad at the moment but it will definitely scratch up the receiver if it get worse. I've put about 500 rounds though it in the past 2 months. Has anyone noticed this? I wonder is this just a "break-in" wear or something I need to talk to Ruger about?

I'm using the factory Glock magwell in case anyone is wondering.
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I'm presuming that the firearm has been thoroughly cleaned, and properly lubed. I also don't know if this is "normal" wear or not.

Suggest you take good pix on all sides/places of the bolt where this deformation is taking place, and save pix. Suggest you also take good pix of the part(s) that are causing the deformation as well.

Suggest you send pix to Ruger for advice and possible service. Picture is worth 1,000 words. Don't mess with it until you hear back with them. See what they say.

The following might well affect your Ruger Warranty: If you can FULLY SUPPORT the area DIRECTLY behind the "raised" bit of metal (I presume the metal is deformed/raised on both sides of the bolt body, I suggest using a small hammer with a flat face to gently tap the raised metal and force it back down a bit. You are just "moving" the metal a little bit, and forcing it back nearly into original position. Don't expect perfection, just an improvement. Suggest you examine the rest of the bolt body for other possible flaws; for example, the screw in the picture above seems to have some raised metal at the circumference of its recessed hole. Sometimes such things can be "moved" back into original configuration, sometimes it is best to gently remove such imperfections

Keep an eye on things, and see what happens.
 

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@Matthew23 - You made me look ;)

This is my bolt from my PC Carbine with about 2,500 rounds through it. The picture makes it look worse than it is in real life.

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That notch is what the last round hold open lever catches:

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That lever is pushed up when you assemble the receiver into the stock, and then pushed up to stop the bolt by the magazine follower when the mag is empty.

The lever is part #43 on the parts diagram in the PC Carbine user manual, page 57, and is the "Last Round Catch".

Not sure of that is normal or not, but I am seeing the same wear on mine. I will check my other PC carbine when I get time.
 

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Discussion Starter · #4 ·
@RIBob Yeah I'm definitely keeping an eye on it from now on to see how it progresses. As Marvin suggested in the post above, the bolt is probably mashed up from hitting the last round catch. Unfortunately we don't get the legendary Ruger customer service in Canada. But I'll email Ruger's Canada service station to see what they think of this
 

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Discussion Starter · #5 ·
@Matthew23 - You made me look ;)

This is my bolt from my PC Carbine with about 2,500 rounds through it. The picture makes it look worse than it is in real life.

View attachment 173377

That notch is what the last round hold open lever catches:

View attachment 173378

View attachment 173379

View attachment 173380

That lever is pushed up when you assemble the receiver into the stock, and then pushed up to stop the bolt by the magazine follower when the mag is empty.

The lever is part #43 on the parts diagram in the PC Carbine user manual, page 57, and is the "Last Round Catch".

Not sure of that is normal or not, but I am seeing the same wear on mine. I will check my other PC carbine when I get time.
Ha interesting... It might be a "feature" if everyone has the same issue. I definitely expected the bolt to be much stronger than the last round catch though. 😅
 

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Different metallurgies. One piece has to sustain minimal force on occasion, the other (bolt) has to sustain maximum force each shot. Suggest NOT trying to pound the displaced metal back to its original position, that never works well. Instead use a very fine file to remove the displaced metal if it causes issues. Chamber pressure differences can make the differences in wear patterns - you pay for how you play.



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Here is my bolt from my PC Carbine that I have put 200 rounds through. I do not know the total through the gun since I got it used.

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I measured the deformity and the first bolt I posted has .009 inches and the second has .004 inches.

Now that I am aware of this I will pay attention each time I take the guns apart. I have sent Ruger a question about this through their online support page contact form.
 

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One piece has to sustain minimal force on occasion, the other (bolt) has to sustain maximum force each shot.
The notch that is being deformed only contacts the Last Round Catch and then only when you fire until the mag is empty or pull the bolt back with an empty mag inserted, so it has zero force on it any other time.

I use my PC Carbines for Steel Challenge matches, that is 90% of my shooting. I very seldom shoot until a magazine is empty , so the bolt seldom locks open on an empty magazine.

I am not very concerned about this, yet. I will keep my eye on it though.
 

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Sent request tor Ruger CS via their web site on 8/1/22
Received email back on 8/2/22 with link to upload photos
Uploaded the photos 8/2/22

I used some of the same pics I have in my previous posts. I will update when they reply again.
 

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The notch that is being deformed only contacts the Last Round Catch and then only when you fire until the mag is empty or pull the bolt back with an empty mag inserted, so it has zero force on it any other time.…
I’m sorry, I wasn’t clear at all. What I meant was that the bolt sustains stress from each shot and cannot be too hard and brittle. That is why when it contacts the harder catch lever it is bound to be slightly deformed by the concentrated impact, as is visible in the bolt photos. This peening suggests that the concentrated force on the bolt at this point may be greater than some imagine.


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Discussion Starter · #13 ·
Has anyone hear back from Ruger yet? I've tried to ask Ruger UAS about this and their reply was "please contact the Canadian repair station". The Canadian repair station is just a third party gunsmith shop so I really don't expect them to get to the bottom of this :(
 

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Here is my bolt from my PC Carbine that I have put 200 rounds through. I do not know the total through the gun since I got it used.

View attachment 173408

View attachment 173409

I measured the deformity and the first bolt I posted has .009 inches and the second has .004 inches.

Now that I am aware of this I will pay attention each time I take the guns apart. I have sent Ruger a question about this through their online support page contact form.
It appears that the deformation of the bolt is occurring at the side (edge) of the bolt, which seems to indicate a force exerted on the bolt in a relatively small area. It is possible that if the same force was "spread-out" in area, the deformation of the bolt would be reduced, perhaps eliminated. I'm not familiar with the construction of these firearms, but if it is possible to obtain the part that is causing this deformation, and if it is possible to re-shape the part in order to widen the impact area on the bolt, the issue could be resolved. If this procedure is possible, suggest getting a number of the required part, as some "trial and error" fitting will be required. Some "Prussian Blue" compound applied to the relevant surfaces will quickly show the wear pattern, It may be that it is possible that vigorous hand-cycling may be sufficient, in lieu of actually firing the firearm, to reveal the wear pattern, Maybe not. There is no way of telling (without some experimentation) if this procedure will "solve" the problem, or if the proposed "re-shaping" will cause other problems.

Peening-down the displaced metal was proposed as a possible "interim remedy" to the situation, as doing so will likely work-harden the metal, thus making it a bit more resistant to being displaced again. One could certainly file-down the displaced metal, but removal of metal in this area would serve to reduce the amount of metal resisting the force applied on the bolt, thus likely increasing future wear. Submit that if it is possible to modify the part that is impacting the bolt, and assuming that that particular part is both inexpensive and easily replaceable, doing so would likely be a much better solution to the problem, in theory, such "theory" needing to be confirmed by experimentation.

It's also possible that the particular part impacting the bolt is not of "correct" configuration which would allow this proposed solution to work at all; the proposed re-shaping" of the part impacting the bolt will only work if the part has enough metal on it to allow the "re-shaped" part to fully contact the impact area on the bolt, and so spreading-out the impact area to place the impact force over a wider area.

Just submitted as a proposal, and as a point of departure for discussion. It would not surprise me that some engineer at Ruger will look at these pix, and come to the conclusion that some parts were not originally and correctly configured, saying "Yep, if we had made [Part X] a little differently, this wear would not be occurring." Sometimes it takes a lot of use for such issues to become apparent. The question is: will Ruger deem the issue to be serious enough to be worth the expense of re-designing the part causing the deformation?

It may well be that the wear seen in the pix above progresses to a certain (acceptable) point, and does not progress further. Who knows?
 

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@RIBob, thanks for the well thought out response.

The part that interacts with the bolt is the lever which is activated by the mag follower to activate the last round hold open.

I have had no operational issues with my guns, but contacted Ruger to ask if this was normal.
 

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Update:

Sent question to Ruger about this on 8/1/22
Uploaded pics of the bolts of both my rifles on 8/2/22
Sent follow-up request today, 8/12/22. It's Friday - so I'm not expecting an immediate answer.

This was all done via the contact form on the Ruger web site. If I thought this was a serious issue I would call.
 
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