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Mark III Lower vs Mark IV Lower

This is a discussion on Mark III Lower vs Mark IV Lower within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; Are the internals of a Mark III 22/45 lower the same as for the Mark IV 22/45 lower? I am about to undertake my first ...


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Old May 15th, 2017, 02:29 PM   #1
 
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Mark III Lower vs Mark IV Lower

Are the internals of a Mark III 22/45 lower the same as for the Mark IV 22/45 lower? I am about to undertake my first trigger job on a handgun. I put a Kidd trigger kit in my 10/22. It was straightforward and worked well. However the handgun seems a bit more intimidating than the rifle.

I bought the Volquartsen accurizing kit for my Mark IV Lite. And I found the long thread in the Rimfires forum here, with Captain Gyros youtube video, etc. It doesn't look too daunting. However, an exploded diagram and some other pictures, etc would be helpful. I have the Gun-Guides Mark III Series booklet. They haven't printed one for the Mark IV, and I am unable to locate any details of the internals of the Mark IV. So if the two Marks are sufficiently similar then I can use the Gun-Guides as well as the youtube video.



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Old May 15th, 2017, 06:06 PM   #2
 
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Watch the video several times and have it up and running when you do it. There is an exploded view of the 22/45 in the manual on the Ruger website on pages 38 to 40. The manual you received with your Lite probably does not have anything on the 22/45.

https://ruger-docs.s3.amazonaws.com/...V-Pc4tS28s.pdf

Last edited by MarkB; May 15th, 2017 at 07:30 PM.
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Old May 16th, 2017, 08:59 AM   #3
 
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The manual helps. Thanks for that. In the part list Ruger has several parts listed with the notation, "Parts so marked must be factory fit". What does that mean?
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Old May 16th, 2017, 09:18 AM   #4
 
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Quote:
Originally Posted by RickCunn View Post
"Parts so marked must be factory fit". What does that mean?
That means they won't send or sell you those parts. You have to send your gun to the factory to have them replaced.

It's kind of a silly notion in most cases. An entire aftermarket industry has sprung up to supply the parts Ruger won't sell.
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Old May 16th, 2017, 09:25 AM   #5
 
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Interesting. Must be a money maker for them.
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Old May 16th, 2017, 10:15 AM   #6
 
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My thought has always been, IF RUGER MADE THE GUNS WITH BETTER TRIGGERS THERE WOULD BE NO AFTERMARKET NEEDED . . .so I believe they ENCOURAGE the AFTERMARKET MANUFACTURERS to add to their Customer Base . . .

GB45
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Old May 16th, 2017, 06:20 PM   #7
 
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I have watched Captain Gyro's video four times and am about ready to dive in. However, I need a little guidance here. I have the 22/45 Lite. Comparing the exploded diagrams between the Lite and regular model there are some minor distinctions. For example on the regular model the Trigger Pivot Retainer Spring (#40) is as shown in Captain Gyro's video. However it is a different shape in the the Lite (#4), probably because the polymer frame won't allow for the same spring design to be used. And there appear to be a couple of other minor differences. I've never gotten into a gun like this and want to be aware of any potential problems. If I get into disassembly, will the Trigger Pivot Retainer removal and replacement be obvious? Are there any other lurking pitfalls a rookie should be aware of?
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Old May 17th, 2017, 04:14 PM   #8
 
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I just completed installing the Volquartsen Accurizing Kit in my Mark IV 22/45 Lite. First ever trigger job on a gun like this. Not hard at all, with the Captain Gyro video so many of you recommended providing the help I needed. Volquartsen should link to him. The very minor differences between the regular Mark IV and the Lite Mark IV were negligible once I got into it.

The average of 10 trigger pulls is 2.41 lbf, versus the as-recevied average of 4.99 lbf. Standard deviations are the same at 0.11 lbf (new) versus 0.12 lbf (old).
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