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My MKII recently started to occasionally fail to fire on the first pull of the trigger. It will always fire on the second pull. Cleaning and oiling haven't resolved the issue. Does anyone have a idea what my next step should be ?

If you have an adjustable trigger, check to be sure it is not set to close not allowing the trigger to come far enough forward to reset the disconnecter.

My first question would be - What modifications have been made to this pistol?

R,
Bullseye

I bought it used and am not sure what if any modifications have been made to the gun. I changed out a aftermarket extractor but haven't been into the main spring case. The trigger pull is crisp and my guess is that it's in the 4-5lb range. The trigger appears to be original and doesn't have an adjustment screw. My plan is to do a poor man's trigger job by replacing the sear with a VOLQUARTSEN target sear. Once I have it apart for the sear replacement I want to make sure I clean up any other lurking problems.

If you have it that far apart, adding the VQ target trigger is a good idea.

Good advice from greener - The VQ sear and trigger are great mods to do. Replace both at the same time and you will be pleased with the results...

Check to ensure that the trigger plunger and trigger plunger return spring are not binding from dirt and grit caused by blow back residue. This is the top part of the trigger that normally gets very dirty. The spring is not very strong and a little grit in the plunger hole can really slow it down.

R,
Bullseye

Break Free Powder Blast works well for cleaning/blowing crud out of the unassembled trigger parts for me. Then I follow up with a shot or two of compressed air to speed drying and remove any leftover crud. Makes for quick work...

Thanks all for the advise. I field stripped it this morning then hit every thing that looked like it should move or spring with a light blast of penetrating oil, then a good blast of compressed air followed with a bit of gun oil. Then I went to the range. It acted up on the one of the first 5-shots then preformed like a new gun on the next 100+ rounds. I never did see anything that looked like it could be causing me all this grief.

It's good to hear that your pistol is working again. If it starts to act up and everything appears clean, you may want to detail strip again and take out the disconnector lever. There may be some dirt or grit caught in behind it causing the lever to slow down. Over time the Ruger shipping preservative gums up and will start to slow down various components. The disconnector is an area that normally doesn't get too much attention and is sensitive to drag. If it operates slowly, then the trigger either won't reset or the pistol's timing is off.

R,
Bullseye

Thanks for the advise Bullseye. My new VQ sear arrived today. I'll be tearing it back apart for the installation this weekend. The disconnector will get close scrutiny while I'm at it.