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MKIII Problems

This is a discussion on MKIII Problems within the Ruger Rimfires forums, part of the Pistol & Revolver Forum category; I shot in a local steel challenge match yesterday with my MKIII target and in the third stage my gun failed to fire. It seems ...


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Old April 11th, 2011, 09:14 AM   #1
 
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MKIII Problems

I shot in a local steel challenge match yesterday with my MKIII target and in the third stage my gun failed to fire. It seems like it is not reseting the trigger. Bolt operates freely, but when trigger is pulled the hammer does not drop. The problem is that I cannot disassemble the gun now. I have tried holding the trigger down and tapping the muzzle on the floor to get the hammer to fall forward, but that doesn't work. When I try to remove the mainspring assembly it only comes out 1/4" and it feels like is under spring tension and will not hinge out all the way. So, I cannot drop the hammer and cannot break it down to inspect for the problem. It did shoot fine the first 2 stages in the match. Any ideas?? Any help is appreciated.
Thanks,
Kevin



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Old April 11th, 2011, 09:37 AM   #2
 
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I believe that you best give Ruger a call it sounds like something broke inside
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Old April 11th, 2011, 10:35 AM   #3
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First of all, welcome to the forum Rugertarget! I am sorry that your first post had to involve an issue!

There is not enough information here to diagnose your problem. The suggestion to call Ruger is a good one. Call or e-mail their customer service.

Can you ensure the firearm is unloaded and can you remove the magazine? The mainspring housing latch is under tension if the hammer is cocked and may be difficult to disengage in that condition but it cannot be moved out beyond what you have achieved with a magazine in place. What you can do, with an empty chamber and magazine, is remove the magazine and cycle the safety to ensure it is free and operative. Reinstall the magazine and see if you can get the trigger/hammer to operate. It is also possible that the “key lock” has engaged (I have heard of one instance where this happened) so go to page 13 of your manual and try disengaging the key lock. If that doesn’t work, try engaging the key lock and then disengaging it to be sure that nothing is stuck.

I have honestly never tried to remove the mainspring with the hammer cocked and it under tension and maybe someone else can tell you if it is possible to even do that but that won’t help if the trigger, sear or hammer are jammed or otherwise inoperative.

Remember, to fire the weapon the magazine must be installed and fully engage (magazine safety interlock) the safety must be in the fire position and the key lock must not be engaged although you should not be able to cycle the safety if the key lock is engaged. These are just a few things to look at if or when you are waiting for a reply from Ruger.

Good luck!
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Old April 11th, 2011, 12:19 PM   #4
 
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I haven't had a single problem with the firearm until now. It has been a great gun. I can ensure the firearm is unloaded and magazine is empty. The bolt operates freely and the safety operates freely and the key lock is disengaged. The trigger does have travel, but it does not release the hammer. I am assuming the hammer is in cocked postion since I can't remove the mainspring and it is under tension. I have also manually released the magazine safety with a screwdriver to make sure it possibly wasn't releasing enough with the magzine in place. I am going to hose it down with gun scrubber this afternoon to make sure some grime is not binding it up. Is there a way to manually release the hammer without use of the trigger?

Thanks for the advise...

Kevin
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Old April 11th, 2011, 02:08 PM   #5
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RT ... I suspect based on your description that your hammer is not fully forward or is partially cocked. Try the process that Dr. Bullseye outlines in #1 at the following troubleshooting link Troubleshooting Page
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Old April 12th, 2011, 01:20 AM   #6
 
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Welcome from Australia. Great place to be, you will like it here.
I hope you get it all sorted out.
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Old April 12th, 2011, 05:19 AM   #7
 
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Problem solved guys! I hosed it down with gun scrubber last night and worked the bolt and the safety for a bit and the hammer dropped so I could get it apart. Hosed it down some more and worked the action. Everything seemed to be in place and not damaged, so I oiled her up and reassembled and everything seems A-Okay for now. Did not get to test fire, but it dry fires ok. One positive thing, This is the first time I have sat down with it and worked the action to actually see how it works, so now I at least know how the internals operate. Thanks for all the replies and the help.
Kevin
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Old April 12th, 2011, 06:55 AM   #8
 
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what brand of ammo were you useing when your MK III locked up
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Old April 12th, 2011, 06:56 AM   #9
 
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Bulk Federal....
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Old April 12th, 2011, 07:06 AM   #10
 
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Federal or CCI is what I usually use I thought maybe you were useing Remington bulk
Thanks for the quick reply
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Old April 12th, 2011, 08:16 AM   #11
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Quote:
Originally Posted by Rugertarget View Post
Problem solved guys! I hosed it down with gun scrubber last night and worked the bolt and the safety for a bit and the hammer dropped so I could get it apart. Hosed it down some more and worked the action. Everything seemed to be in place and not damaged, so I oiled her up and reassembled and everything seems A-Okay for now. Did not get to test fire, but it dry fires ok. One positive thing, This is the first time I have sat down with it and worked the action to actually see how it works, so now I at least know how the internals operate. Thanks for all the replies and the help.
Kevin
Kevin,

I am glad everything worked out. I really don’t know how long you have had the firearm or how many rounds went through it before you experienced the “lock up” but it may give you a good indication on time (or rounds) between cleaning. If the firearm was new and never initially cleaned you may have had some factory debris in it but the important part is that you are back to shooting!

Some of the MKIII owners here have many tens of thousands of rounds through their models and they are still going strong. I have a mere 10,500 (give or take a few hundred) rounds through mine and much more than half those rounds are bulk federal so the ammo is not likely the cause.

In any case, enjoy your next range trip, welcome again to the forum and now go enjoy the fun and informative posts this forum has to offer. There are a lot of great folks here!
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Old April 12th, 2011, 09:11 AM   #12
 
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I have had my MKIII for about 1 year. I shoot a weekly bowling pin match and just started a monthly steel challenge match plus just my normal practicing. I have roughly put 2200 rounds through it so far with absolutely no problems. I normally clean it once a week, however it was a little gunky down in the action area. I normally give the bore and the bolt a good cleaning before the weekly bowling pin match, and clean the best I could down in the action area with a rag, which probably was not good enough. It needs a good blast with gun scrubber every now and then. So my problem had a lot to do with me. Anyway, she is spit shined now and ready for another 2200 rounds.
Kevin
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Old April 13th, 2011, 03:47 PM   #13
 
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Quote:
Originally Posted by BuckJM53 View Post
RT ... I suspect based on your description that your hammer is not fully forward or is partially cocked. Try the process that Dr. Bullseye outlines in #1 at the following troubleshooting link Troubleshooting Page
#1 just helped me!!!!!! I reassembled the mkiii and it just didn't seem right. When I tried to disassemble I had the same trouble.

I think I reassembled it with the "dingleberry" in the wrong position.

THANKS Buck ole' buddy!!!
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Old April 13th, 2011, 07:03 PM   #14
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You're welcome Karl ... Always glad to help
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Old April 14th, 2011, 01:59 PM   #15
 
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A quality weapon. Love our 22/45 and 10/22.
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