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Old 09-04-2019, 06:31 PM
Mike3838
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Machine marks on bolt.



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About a year ago I bought a new MkII, yes new, that I found in a pawn shop in Wisconsin. Shot 100 rounds, then took it apart to install a Volquartsen trigger kit, better rear sight, and better grips. 2000+ rounds later I decided it was time to take it apart again for a good cleaning. I noticed flat spots on each side of the bolt stop pin. Looking further, the channel in the bolt that the stop pin rides in has serious machining chatter marks in it, and wore flats on the stop pin. I took some 600 grit sand paper to smooth out the chatter marks, then finished with 1000 grit. Chatter marks are still visible, but feel much smoother.


Yes, I lube the pistol regularly, probably over lube by most people's standards. I even make sure I put a drop of oil inside each side the bolt channel, and the outside, and do so every 30-40 rounds.


I have a MkII 22/45 with tens of thousands of rounds through it and the bolt stop pin is still round, with only the bluing worn off on either side. No chatter marks in the bolt channel.


So, has anyone else had this happen to them? Did sanding the inside of the bolt channel cure the problem? Or do I have a pistol that is going to chew itself up over time? I haven't shot it since, but plan to in the next week or two.
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Old 09-04-2019, 07:29 PM
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Any chance your bolt is a stainless two piece?
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Old 09-04-2019, 08:27 PM
Mike3838
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Originally Posted by 27 Beck View Post
Any chance your bolt is a stainless two piece?

Mine is blued. Did the blued guns have two piece bolts?
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Old 09-05-2019, 03:07 AM
FredVK
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I don't think your Ruger is going to self destruct over this. And you have smoothed it out. Worse case scenario is you at some point install a new bolt stop pin. Ebay, $15. Just shoot and enjoy.
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Old 09-05-2019, 09:12 AM
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Quote:
Originally Posted by Mike3838 View Post
Mine is blued. Did the blued guns have two piece bolts?
Hi Mike,

My "new" MkII 6" SS Standard has about 500 rounds through it and the bolt stop pin and bolt channel doesn't display any type of stressed chatter marks, but I finally smooth out the machining marks by polishing both with Mothers Mag & Al. Polish!

Not sure about the "blued" steel guns, but my New MkII SS 6" Standard came with a 2-piece bolt! Check the pic (taken before polishing bolt stop pin channel) and see if yours displays this past 2-piece design!

Ted
Attached Images
File Type: jpg MkII Standard 2-Piece Bolt.JPG (444.5 KB, 10 views)
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Old 09-05-2019, 12:51 PM
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Quote:
Originally Posted by Mike3838 View Post
About a year ago I bought a new MkII, yes new, that I found in a pawn shop in Wisconsin. Shot 100 rounds, then took it apart to install a Volquartsen trigger kit, better rear sight, and better grips. 2000+ rounds later I decided it was time to take it apart again for a good cleaning. I noticed flat spots on each side of the bolt stop pin. Looking further, the channel in the bolt that the stop pin rides in has serious machining chatter marks in it, and wore flats on the stop pin. I took some 600 grit sand paper to smooth out the chatter marks, then finished with 1000 grit. Chatter marks are still visible, but feel much smoother.
..
So, has anyone else had this happen to them? Did sanding the inside of the bolt channel cure the problem? Or do I have a pistol that is going to chew itself up over time? I haven't shot it since, but plan to in the next week or two.
I suspect Ruger filed the sides of the stop pin - not the bolt, considering how few of rounds you've put thru.

My story of 5 Ruger bolts:

1st was my first NIB MKIII. It had terrible finishing thoughout - including really bad chatter in the bolt (both sides). I used a small diameter sanding disk for my Dremel and took the chatter down to visible, but fairly smooth. The stop pin is still round.

2nd was a (highly) used MKII. The bolt had some chatter, but was fairly smooth. The pin is still mostly round (after many, many thousands of rounds).

3rd was a replacement MKIII bolt after my first one broke. The chatter level was between the previous 2 bolts, and I smoothed it off the same way.

4th was another NIB MKIII bolt. I bought the pistol as a host frame to send my 1st receiver back to Ruger for barrel replacement (the chamber was cut crooked). The bolt had heavy chatter on the left side, while the right side was smooth. The bolt would stick back in either MKIII receiver, but I know the chatter wasn't why. The bolt had another area that needed some points smoothed down. The pin was new and round when I sent the pistol in. When Ruger returned it, the barrel problem had been ignored but Ruger had filed the sides of the stop pin flat. I was VERY unhappy with CS and called to complain. They had me send it back and they replaced the pistol with a MKIV.

5th was the MKIV bolt. Very nicely finished with no chatter and the stop pin was round.

Filing the stop pin sides is a bad idea IMO. It may prevent a particular bolt from sticking back, but it prevents you from moving the bolt or MSH around between multiple guns you may own. Ruger CS either doesn't understand that the bolt should be smooth and chatter free, or they don't care. It's just easy peasy to file down a perfectly good stop pin.

I think sanding down the tooling marks and other rough areas is the way to go!
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Old 09-05-2019, 06:38 PM
Mike3838
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Just checked my MkII in question, it appears to have a one piece bolt. According to the replies here so far, it looks like I did the right thing by sanding the bolt channel to smooth away those chatter marks. I'll put another 2000 or so rounds through it and recheck, but I now have a feeling things will be just fine.


On a side note, I bought a set of Rink anatomical grips for this MkII and they should be in my possession in about a week. It will be interesting to see if that helps. I bought a set of Rink grips for my Benelli target pistol, and once I figured out how/where to place my hand while gripping, my scores jumped up quite a few points. Hoping the same happens with this MkII. The Ruger will be my back-up gun to the Benelli, and I'm looking to have similar feeling grips.
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