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Old December 30, 2012, 06:22 PM   #1
spacecoast
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Can a misfeeding Ruger Mark II magazine be revived?

I have a total of four magazines for my Ruger MKII512. A couple of years ago I discovered that one of them consistently misfeeds one or two rounds per mag, and now another one does as well. I have cleaned them inside and out (with disassembly) but the problem persists. The remaining two magazines function fine.

Does anyone know the common cause of feeding issues and if/how the magazine might be tweaked to correct this? When a misfeed occurs, the old brass usually fails to eject and gets stuck behind the next round, which gets partway into the chamber. Holding the bolt back, you can usually pluck out the old brass and then let the bolt go to seat the next round.

Last edited by spacecoast; December 30, 2012 at 06:51 PM.
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Old December 30, 2012, 07:19 PM   #2
ritepath
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A friend of mine has a 22/45 mag that he dropped once, it's never fed right since. He's showed it to everyone to find any damage but it's just not there, still it won't feed properly for crap.

Thanks for making me aware that I only have one mag for my MKII.
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Old December 30, 2012, 07:54 PM   #3
Oswald
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MK II Mag feed problem

Try rounding off the sharp inner edges of the magazine.(open area where cartridge is visible). Use small file or Dremel type tool with cutoff disc or small grinding wheel. Simulate front opening / grind a smaller radius. This operation worked wonders with my MK II's. 24 magazines.

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Old December 30, 2012, 10:38 PM   #4
drail
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Are the rounds that misfeed the last 2 or is it just random? If it is the last several rounds you need a new spring. On the rounds that fail to eject, are they getting hooked by the extractor and being pulled out and being struck by the next round out of the mag?
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Old December 30, 2012, 10:53 PM   #5
dahermit
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Quote:
When a misfeed occurs, the old brass usually fails to eject and gets stuck behind the next round,
If a case is failing to eject, there may be some issue with the extractor. The first thing to do is NOT to start filing or sanding on the magazine lips because if they are not the problem, they soon will be. If you do not want to take it to a gunsmith but investigate the cause yourself. Try to slip a fired case under the extractor and get the empty case back into the chamber. Put one round into the affected magazine, insert it into the gun. Pull back slowly on the slide and watch what happens in an attempt to see why the empty case is not being extracted and thrown clear by the ejector. Test, experiment, but cut no metal until you are very sure what is causing the problem. Nevertheless, it sounds like more of an ejection problem than a magazine problem.
Examine both the extractor and its spring (.22's are very dirty, things get sticky very quickly), and the ejector.
One other thing to try, is a new box of cartridges...I have an old brick of .22's that fire, but do not have the required power/force for the empties to clear the chamber of my Buckmark.
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Old December 31, 2012, 07:33 AM   #6
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Are the rounds that misfeed the last 2 or is it just random? If it is the last several rounds you need a new spring. On the rounds that fail to eject, are they getting hooked by the extractor and being pulled out and being struck by the next round out of the mag?
It's just random, sometimes it's well down in the mag, sometimes not. The rounds that fail to eject are getting hooked and pulled but are not exiting before getting stuck between the tail of the next round and the far-side wall of the receiver (away from the exit port).

Quote:
Put one round into the affected magazine, insert it into the gun. Pull back slowly on the slide and watch what happens in an attempt to see why the empty case is not being extracted and thrown clear by the ejector. Test, experiment, but cut no metal until you are very sure what is causing the problem. Nevertheless, it sounds like more of an ejection problem than a magazine problem.
Thanks, I do need to run rounds through manually to see if I can recreate the problem. Removing the bolt and disassembling/cleaning the extractor as much as possible is also a good idea, although I am still pretty sure that it's magazine-related as it only happens with the same two magazines.

Last edited by spacecoast; December 31, 2012 at 08:26 AM.
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Old December 31, 2012, 09:49 AM   #7
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Be very aware of muzzle direction and trigger discipline when performing those tests. I suggest doing this outside.
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Old December 31, 2012, 09:58 AM   #8
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What kind of ammo are you using and what is the shape of the bullet? I have noticed problems with truncated cone bullets on my 22/45.
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Old December 31, 2012, 02:08 PM   #9
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I have an old Mark I mag that has always been problematic also. The original one has never failed and neither has a cheap Ramline Hi-cap with "constant-force spring." I could never figure it out either.
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Old December 31, 2012, 02:42 PM   #10
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Don't know if it applies here, but according to articles I've read on designs for .22 RF magazines, and why many older designs were never reliable, stated that retention at the forwards portion of the feed lips was a key factor.
Some more reliable .22 mag lips have small nibs or indentations near the front.

Been awhile since I've owned a Ruger autoloader, mine was never particularly accurate so I sold it off long ago. I remember mine as being extremely reliable with the original mag and a 12 round replacement. It would even feed .22 Shorts flawlessly so long as I put only six in the magazine, and tapped the mag to shift the rounds towards the front.

The Rugeris a great design, but just never felt right in my hand, far too bulky for a .22.
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Old December 31, 2012, 08:20 PM   #11
spacecoast
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Quote:
What kind of ammo are you using and what is the shape of the bullet?
I use two kinds - Federal bulk ammo (copper hollowpoint) and Federal target match, which is lead round nose solid.

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Be very aware of muzzle direction and trigger discipline when performing those tests. I suggest doing this outside.
Will do.
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Old December 31, 2012, 11:27 PM   #12
Andrewh
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one last thing to try.
since you took them apart already.

swap the guts of a known good one with a known bad one and see if you can replicate the problem with either mag.

if it follows the internals, then swap the follower only.

the part it follows or stays with is your problem.

you may see if ruger will fix it.
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