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Old 08-29-2018, 07:05 PM
gunsmither
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MK4 Bolt; same as other versions of Ruger MK's?



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Don't own a MK4 myself, yet. Can anyone tell me if the MK4 Bolt is the same as the previous versions of Ruger MK series pistols? I am particularly curious about the extractor, and extractor plunger; size of extractor, and length of extractor plunger.

I would appreciate any information that anyone has. Thanks very much! Joe
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Old 08-29-2018, 08:29 PM
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There are some subtle differences. I don't remember what they are, but Lee Wirthwein sent me a picture of them compared once. All I know is, my factory MKIV bolt never ran worth a crap in anything other than my MKIV upper. Did not run in my LLV4 upper, did not run in my or my cousin's MKIII Pac-Lite uppers either. I sold it with a Halo racker on Ebay for like $100 and bought another VQ for that 22/45 Pac-Lite. It was a light strike machine even with a VQ firing pin in anything besides the MKIV Standard upper that it came with. In the factory upper, it was utterly reliable for the small amount that I shot it.
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Old 08-29-2018, 08:32 PM
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The plunger and extractor is probably the same. The VQ extractor fits just fine in it, and its the same extractor they make for all MK series pistols. My issues hinged a hair on bolt binding in a Pac-Lite, and light strikes in nearly everything other than what it came in. I didn't have extraction issues in any format.
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Old 08-30-2018, 09:14 AM
gunsmither
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Thanks for the info Flash. Much appreciated. Joe
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Old 08-30-2018, 09:25 PM
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IIRC, Ruger hasn't made/sold Mark II bolts for years, and all new ones are for both the Mark III and IV, and are backwards compatible with Mark II or original 22/45s.

Not up on Standards or Mark Is.
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Old 08-30-2018, 11:31 PM
gunsmither
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Thanks Racer X. Kind of figured that was the case, but nice to hear others confirm it
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Old 08-31-2018, 09:12 PM
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Here's that pic. IMGUR was acting up last night and I never could upload it. You can look for any differences. Lee Wirthwein (Wirthwein guns) is on MeWe.com (has a group) and is full of a ton of information on MK series guns. Has a dang fine gun shop in Indiana as well. A chat session with him if you can catch his interest can turn into a 45 minute affair, but he can tell you quite a bit. He's volunteered up a lot of information to me that turned some of my sketchy builds into runners over some trial and error.


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Old 08-31-2018, 09:16 PM
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I've tried my Mark IV bolt in my Mark III Hunter and it worked flawlessly. I also swapped the Mark III into my Mark IV. Again no problems.

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Old 08-31-2018, 09:37 PM
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You had a good one. Mine never worked in my LLV4 basically at all, and worked terribly in my MKIII Pac-Lite. It cost me $239 for VQ bolt in the end. Though that would have happened eventually. It had a VQ firing pin and extractor in it as well. Still would screw you if you ever attempted to use it in competition.
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