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Mark IV issues and suggestions welcome

This is a discussion on Mark IV issues and suggestions welcome within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; I bought my Mark IV Hunter about 10 weeks ago. In that time it has had five trips to the range. During first four trips ...


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Old May 4th, 2017, 06:12 PM   #1
 
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Mark IV issues and suggestions welcome

I bought my Mark IV Hunter about 10 weeks ago. In that time it has had five trips to the range. During first four trips there were recurrent issues with magazines falling out, loose grip, safety lever and receiver frame screws, and occasional failures to feed and eject, etc. The pistol was sent back to Ruger for service and just returned. According to the service note, Ruger replaced the magazine latch, repaired the ejector rivet, grip screws, etc. Trip number five (post repairs) to the range: Screws stayed put, magazines did not fall out, spent rounds ejected properly, but several live rounds failed to chamber properly. The rounds would get stuck, with about 1/2 the length of the round sticking out of the breech end of the barrel. Using a wood dowel, and working muzzle to breech, I was able to push the stuck rounds out. This particular problem was not as bad, when I sent the pistol back to Ruger the first time. For the last trip to the range I was using CCI Mini Mags and Remington Golden Bullets. The problem with rounds getting stuck did seem more frequent with the Remington rounds, although I have used these before without a similar problem.
I called Ruger Customer Service, and they recommended returning the pistol for further evaluation. There is no question Ruger Customer Service is first-class, and very responsive to concerns. That said, this is a little disappointing.
I have no problem returning the pistol for another try at solving the problems. Before I go that route, I was wondering if there were some thoughts about what the issue might be, or some suggested simple fixes I can try before sending the pistol back? I did give the pistol a thorough cleaning after getting it back from Ruger, before the latest trip to the range.
Thanks in advance for the input-it is most appreciated!!



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Old May 5th, 2017, 05:53 AM   #2
 
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Is the pistol completely stock, or have you installed some "upgrades"?

The 2 most common things that cause your problem are aftermarket extractors and burrs in the magazines.

Aftermarket extractors have sharp points on the bottom of the hook that should be rounded off to let the round slide up the bolt recess smoothly. Ruger extractors are already rounded.

New magazines are typically stamped, folded, blued, assembled, and shipped without much effort to smooth off burrs. A little time with some 6-800 grit sandpaper smoothing the button track and the feed lips pays big dividends.

Check these things and let us know your progress.
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Old May 5th, 2017, 06:44 AM   #3
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Hello HTT ... Sorry to hear of your problem. While MK series pistols often have the first round "nosedive" into the feed ramp if the nose of the first round is not pushed upward before the magazine is inserted (creating feeding issue similar to what you describe), if this is happening other than the first round this sounds more like you are dealing with a chamber that has a very tight tolerance or perhaps a burr (assuming the ammo is not out of spec). I'm curious if you noticed any unusual marks on the case after you tap them out?

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Old May 6th, 2017, 05:44 AM   #4
 
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Update

Thanks for the suggestions. The gun is all stock-no "upgrades". A second call to Ruger Customer Support offered the advice of not returning the gun quite yet. They recommended trying various ammo's to see if it is more a problem with a specific type of ammo than with the gun per se. OK, I'll give it a try and provide a follow-up.
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